Wintering and protection from adverse factors

Frost

The pear is classified as a moderately winter-hardy crop. In a state of deep dormancy, most European pear varieties (Pyrus communis) can withstand short-term temperature drops to -25…-30 °C (Rieger, 2010). However, frost resistance depends on the variety, rootstock, tree age, and, most importantly, on how well the plant has prepared for winter.

Pear wood is damaged by prolonged exposure to temperatures below -25 °C. In some varieties, flower buds can be damaged even at -20 °C (Westwood, 1993). The pear's root system is less frost-resistant than the above-ground part: active (absorbing) roots are damaged already at -2…-5 °C, especially on clonal rootstocks (Potapov et al., 2000). Therefore, snowless winters with deep soil freezing pose a particular danger.

The frost resistance of the Ussuri pear (Pyrus ussuriensis) is significantly higher—up to -50 °C—but its fruit quality is inferior to European varieties (Westwood, 1993). For amateur gardening, it is important to select varieties zoned for the specific region.

Spring Frosts

This is perhaps the most insidious factor. The pear blooms early—often 1–3 weeks earlier than the apple tree (Rieger, 2010). It is the flowers and young ovaries that are most sensitive to returning cold spells.

Critical temperatures for different stages of pear flower development (Westwood, 1993):

• Buds ("pink bud" stage): -2.8…-3.9 °C
• Full bloom: -2.2 °C
• Young ovaries: -1.1…-1.7 °C

At -2.2 °C during flowering, about 10% of flowers die, and at -4 °C—up to 90% (Westwood, 1993). Frosts are especially dangerous when combined with wet weather, which can trigger the development of bacterial blight (Rieger, 2010).

Interestingly, the frost resistance of flowers is not constant: if cool weather preceded the frost, the plants "harden" and suffer less damage. A sharp cold snap after a prolonged warm spell is the most dangerous scenario (Westwood, 1993).

Drought

The pear tolerates drought better than the apple tree—its root system penetrates deeper into the soil (up to 6–8 meters). However, prolonged moisture deficiency negatively affects shoot growth, flower bud formation, and fruit size and quality (Rieger, 2010).

Under water deficit conditions:

• Shoot growth stops.
• Leaves lose turgor, photosynthesis decreases (Srivastava, 2020).
• Fruits become smaller and less juicy.
• The formation of flower buds for next year's crop deteriorates.

Moisture deficiency is especially critical during the period of active fruit growth and immediately after harvest, when flower buds for the following year are being set.

Heat

High temperatures (above +30…+35 °C) combined with intense solar radiation can cause:

• Bark burns on the southern side of the trunk and skeletal branches.
• Sunburn on fruits—the appearance of brown spots on the skin and softening of the flesh (Srivastava, 2020).
• Premature fruit ripening with deterioration of taste.
• Reduced photosynthesis intensity due to damage to chloroplasts.

In pears, as in other pome fruits, the optimal temperature for photosynthesis is 18…25 °C. When this threshold is exceeded, respiration increases faster than photosynthesis, and the tree begins to consume accumulated substances at the expense of the crop (Potapov et al., 2000).

Strong Wind

Wind affects the pear in a complex way:

• Mechanical damage: broken branches, bark stripping, fruit damage from falling.
• Increased evaporation of moisture from leaf surfaces, exacerbating drought.
• Hindering the work of pollinating insects during flowering.
• In winter, wind intensifies cooling and can cause tissue desiccation (so-called "wind drought").

Young trees with an underdeveloped root system are especially vulnerable to windthrow (Buckingham, 2010). Pears grafted onto quince rootstock have a shallow root system and require mandatory staking (Rieger, 2010).

Hail

Hail causes direct mechanical damage:

• Tears and punctures in the bark on young shoots.
• Dents and tears on fruits.
• Leaf damage, reducing their photosynthetic activity.

Wounded areas become "gateways" for disease pathogens—bacterial blight, moniliosis, and various rots. Large hail during flowering can destroy the entire current year's crop (Buckingham, 2010).

Snow and Ice Loads

Wet snow and freezing rain create excessive loads on branches. They are especially dangerous for:

• Trees with a dense crown that poorly lets precipitation through.
• Varieties with brittle wood.
• Trees with narrow branch angles (mechanically weak attachments).

Under the weight of snow or ice, not only small branches but also large skeletal limbs can break. Cracks and fractures are also entry points for infections (Krivko, 2014). Trees that have not completed growth by the start of winter are particularly affected.

Brief summary of the chapter: The pear is vulnerable to a range of winter and spring factors. The main threats are frost (especially in snowless winters), returning spring frosts during flowering, summer drought and heat, and mechanical damage from wind, hail, and snowfall. Understanding these risks is the first step to competent garden protection.

Completing Growth

One of the main causes of winter damage is incomplete shoot growth. Growing tissues are not capable of hardening and are damaged even by slight frosts (Westwood, 1993; Potapov et al., 2000). Therefore, anything that stimulates late growth—excess nitrogen, late watering, warm wet autumn—makes the tree vulnerable.

What the gardener should do:

• Stop nitrogen fertilizing from midsummer. Nitrogen stimulates vigorous shoot growth that does not have time to mature before winter. Switch to phosphorus-potassium fertilizers—they promote wood maturation and carbohydrate accumulation (Potapov et al., 2000).
• Pinching the tips of growing shoots (if autumn is warm and growth does not stop). This stops elongation and directs nutrients toward tissue maturation. This should be done no later than 3–4 weeks before expected frost.
• Removing root suckers and water sprouts—they drain the tree's strength and often do not mature by winter.

The physiological mechanism is simple: when daylight shortens and temperatures drop, sugars and proteins accumulate in the tissues, increasing the concentration of cell sap, which lowers the freezing point. Additionally, protective proteins (dehydrins) are synthesized, which bind water and prevent ice crystal formation inside cells (Agustí, 2010). Without stopping growth, this mechanism does not activate.

Moisture-Charging Irrigation

This is one of the most underestimated but important techniques. Moisture-charging irrigation is abundant watering in late autumn, after leaf fall, but before persistent frost sets in.

Why it is needed:

• Moist soil freezes more slowly and to a shallower depth than dry soil—this protects the roots (Cornell Guide, 2003).
• The tree accumulates moisture in its tissues, reducing the risk of winter desiccation (especially in regions with strong winds and thaws).
• In spring, the tree starts growing faster because there is available moisture in the soil.

How to do it:

• Water when most leaves have fallen but the ground is not yet frozen.
• Watering rate: 8–12 buckets (80–120 liters) of water per mature tree, for young trees—4–6 buckets. The water should soak the soil to a depth of 50–80 cm, where the bulk of the absorbing roots are located (Potapov et al., 2000).
• If autumn is rainy, watering can be reduced, but if it is dry, it is mandatory.
• Water in several sessions so the water soaks in rather than running off.

Important: moisture-charging irrigation should not be confused with summer watering. Its purpose is not to nourish the tree for growth but to create a thermal buffer in the soil and provide a reserve of moisture for spring.

Autumn Care

In autumn, it is important to carry out a number of measures that will strengthen the tree's health and reduce the risk of disease and pest damage in winter and early spring.

Fertilizing. Autumn is the time for phosphorus-potassium fertilizers. Phosphorus strengthens the root system, potassium increases winter hardiness and drought resistance. Nitrogen is not applied!

• Superphosphate (30–40 g/m² of the trunk circle) and potassium sulfate (20–25 g/m²) are worked into the soil during digging.
• Organic matter (manure, compost) is applied once every 2–3 years, but no later than September, so that it has time to partially decompose.

Sanitary pruning. Remove all dry, diseased, broken branches. Clean the cut sites and treat them with garden paste. This reduces the risk of fungal diseases spreading and also reduces the number of places where pests can overwinter (Krivko, 2014). Formative pruning is best postponed until spring—autumn pruning stimulates growth and weakens the tree before winter.

Leaf and fallen fruit cleanup. Fallen leaves and fruits are an ideal environment for overwintering scab, moniliosis, and other disease pathogens (Rieger, 2010). Collect them and put them in the compost heap (if it heats up well) or remove them from the site. Under no circumstances leave them under the tree for the winter.

Pest and disease treatment. After leaf fall but before frost, treat the tree and the soil of the trunk circle with a 5% urea solution (500 g per 10 L of water) or 3% Bordeaux mixture. This will destroy overwintering stages of fungi and pest eggs (Cornell Guide, 2003).

Mulching

Pear roots are less frost-resistant than the above-ground part. In snowless winters, they can be damaged already at -5…-10 °C at the root depth (Westwood, 1993). Mulch is a reliable protection for the root system.

Mulch materials:

• Manure or compost—not only insulates but also enriches the soil. Layer 8–10 cm.
• Peat—retains heat well but can acidify the soil, which is undesirable for pears (they prefer pH 6–7). Use only deacidified peat.
• Sawdust, wood chips, shredded bark—excellent insulation, but they need to be mixed with nitrogen fertilizers in spring as they consume nitrogen during decomposition.
• Straw, hay—light and accessible material, but they can be scattered by rodents, so it is better to press them down with branches or boards.

Mulching rules:

• Mulch is spread after the soil has frozen slightly (usually in late October–November). Too early mulching can delay soil freezing and cause continued root growth (Cornell Guide, 2003).
• Mulch layer—8–15 cm, but not right up to the trunk (leave 5–10 cm of free space to avoid bark rotting).
• For young trees, the mulching area should correspond to the crown projection; for adults, the trunk circle is 1.5–2 m in diameter.

In spring, when the threat of severe frost has passed, the mulch is raked away from the trunk and loosened so that the soil warms up faster.

Brief summary of the chapter: Preparing a pear for winter is a set of measures: stopping nitrogen fertilizing and stimulating tissue maturation, mandatory moisture-charging irrigation, sanitary cleaning and disease treatment, and mulching the trunk circle. A properly prepared tree suffers significantly less from frost, sunburn, and spring weakness.

Whitewashing

Whitewashing the trunk and bases of skeletal branches is one of the oldest and most effective techniques. Its main purpose is not aesthetic but protective.

Why whitewash the pear:

• Reflecting sunlight. In winter and early spring, the sun heats the dark bark on the southern and southwestern sides of the trunk. During the day, tissues thaw, and at night, during a sharp cold snap, they freeze again. Such fluctuations destroy cambium and phloem cells, causing so-called sunburn (Westwood, 1993). Whitewash reflects up to 70–80% of sunlight, preventing the bark from overheating.
• Protection from frost cracks. By equalizing day and night temperatures of the bark, whitewashing reduces the risk of crack formation (frost cracks).
• Preventing pest infestation. Many insects (e.g., codling moth, scale insects) overwinter in bark crevices. Whitewash with added insecticides or simply lime creates an unfavorable environment.

When and how to whitewash:

• Optimal time—late autumn (November) and again—in late February – early March, when the sun begins to heat up, especially in southern regions.
• Air temperature should not be below +2…+5 °C so that the solution does not freeze and adheres well to the bark.
• Whitewash not only the trunk but also the bases of skeletal branches (to a height of 1.5–2 m from the ground, and for young trees—up to the first fork).
• Composition: slaked lime (2–3 kg per 10 L of water) + clay (1 kg) + copper sulfate (200–300 g) for an antiseptic effect. For better adhesion, add 100 g of casein glue or 1 glass of milk (Buckingham, 2010).
• Layer thickness—at least 2–3 mm. Before whitewashing, clean the old bark of exfoliations and lichens (carefully, with a scraper or brush, without damaging living tissues).

What if the whitewash is washed off by rain? Repeat the treatment at the first opportunity. Autumn whitewashing is considered the main one, spring whitewashing is corrective.

Protection from Sunburn

Sunburn is not just a cosmetic defect. Bark death opens the way for fungi and bacteria, can cause ring damage to the trunk, and this practically guarantees the tree's death.

The main protection methods besides whitewashing:

• Wrapping the trunk. Young trees with thin bark (up to 5–7 years) can be wrapped with light non-woven material (white spunbond, lutrasil), wrapping paper, or special garden tape. The wrap is left until spring and then removed to avoid bark rotting.
• Shading. In regions with bright winter sun (mountain areas, southern regions), a temporary shield of boards or branches can be installed on the south side of the tree to scatter direct sunlight during the most dangerous hours.
• Preserving snow. Snow near the trunk is an additional reflective screen that reduces bark heating and protects the root collar.

Signs of sunburn: the bark turns brown, cracks, peels off, and dry spots appear on the trunk. If the burn is only on one side, the tree may survive, but the wound needs urgent treatment (clean to living tissue, disinfect with a 1% copper sulfate solution, and cover with garden paste).

Frost Cracks

Frost cracks are longitudinal cracks on the trunk and thick branches, arising from uneven tissue contraction during a sharp cold snap. They differ from sunburn in that they appear as a result of deep freezing, not fluctuations in daytime temperatures.

How to prevent:

• Proper winter preparation (see Chapter 2)—mature wood is less prone to cracking.
• Wrapping the trunk. To prevent frost cracks, use jute burlap or straw mats, which are fixed on the trunk for the winter. Unlike reflective materials, here the emphasis is on insulation, but such wrapping also works as protection from the sun.
• Maintaining snow cover. A snowdrift near the trunk reduces the freezing depth and serves as natural insulation.

If a frost crack has already appeared:

• Do not leave it unattended. A crack is always a risk of infection (Westwood, 1993).
• In early spring, clean the edges of the crack with a sharp knife to healthy tissue.
• Disinfect with a 3% copper sulfate solution or 5% iron sulfate solution.
• Cover with garden paste or a special paste, and wrap with burlap on top to prevent the wound from drying out.
• In some cases, a "bridge" graft helps, but for the amateur garden this is a complex method; it is easier to clean and monitor the wound's healing (Krivko, 2014).

Important: frost cracks often occur in varieties with thin bark, as well as in trees growing on overly fertile soils or overfed with nitrogen. Attention to agricultural practices is the best prevention.

Covering Young Trees

Young pears (up to 3–4 years) are especially vulnerable because their bark is thin, wood is not fully mature, and the root system is not yet deep enough. Covering them for the winter is a mandatory measure in most regions (Buckingham, 2010; Cornell Guide, 2003).

How to properly cover a young pear:

• Frame covering. A wire or wooden frame (in the shape of a cone or pyramid) is installed around the tree, filled with dry leaves, straw, and covered with breathable material (spunbond, burlap) on top. It is important that there is an air gap inside—it retains heat better than the material tightly fitting the bark.
• Trunk wrapping. You can simply wrap the trunk with several layers of non-woven material or thick paper, but without sealing—so the bark can "breathe." Film (polyethylene) is not suitable—condensation accumulates under it, and the bark may rot (Cornell Guide, 2003).
• Bending down. In very severe regions, you can bend the young tree to the ground and cover it completely (this method is more often used for shrubs, but for dwarf pears on quince rootstock, it may be justified). The ground around is sprinkled with straw or sawdust.

When to cover and uncover:

• Cover after the soil has frozen slightly to avoid stimulating continued growth (usually late October–November).
• Uncover in spring, when the threat of severe frost has passed, on a cloudy day, so the bark gradually gets used to the sun. Do not delay—vegetation may start prematurely under the cover.

Regional specifics:

• In southern regions (Mediterranean, southern USA, Crimea, Caucasus), covering is usually not required, but whitewashing and sun protection are mandatory.
• In the temperate zone (central Russia, Western Europe, northern USA), only young trees are covered (the first 3–4 winters).
• In northern regions (Siberia, Urals, Canada), it is recommended to cover trees up to 5–6 years of age, and also use exclusively frost-resistant varieties and rootstocks (Westwood, 1993).

Brief summary of the chapter: Protecting the trunk and crown is not only whitewashing but a comprehensive approach: reflecting sunlight, preventing and treating frost cracks, covering young trees, and regular inspection. The main goal is to preserve the integrity of the bark and cambium, because it is through these tissues that water and nutrients are transported, and their damage is the main cause of the weakening and death of the pear.

Rodents

The most dangerous rodents for pears are voles (field mice). In the temperate zone, there are two main species: the common vole (Microtus arvalis), which lives on the surface, and the underground vole (Microtus subterraneus), which lives in the upper soil layers (Cornell Guide, 2003). Both species actively eat the bark from the lower part of the trunk and the root collar in winter. Even partial ring damage to the bark disrupts nutrient transport and almost always leads to the tree's death (Westwood, 1993).

Signs of vole presence:

• Gnaw marks on the bark at the base of the trunk (usually 5–10 cm from the ground, under the snow).
• Holes and tunnels in the ground near the roots.
• Gnawed roots, especially in young trees.
• For diagnosis, you can put bait (a piece of apple or carrot) under a slate or plywood shelter overnight—if the bait disappears or is heavily gnawed, rodents are active (Cornell Guide, 2003).

Control and prevention methods:

• Physical protection of the trunk. The most reliable way is to install a cylinder of fine-mesh galvanized steel netting around the trunk (mesh size no more than 6–8 mm). The netting should be 60–80 cm high to cover the snow cover level and buried 10–15 cm into the soil to prevent voles from digging underneath. For adult trees, plastic spiral protective tapes can be used.
• Habitat management. Voles like dense grass, weeds, and mulch, which provide them with shelter. Mow the grass in the trunk circles and between rows short (height no more than 5–10 cm). Do not leave straw, hay, or a thick layer of mulch under the trees where rodents can settle—it is better to use wood chips or sawdust that do not attract them.
• Traps. In small gardens, live traps or mousetraps set at the base of trees are effective. Bait—pieces of apple, carrot, grain. Check traps daily.
• Natural enemies. Attract birds of prey (owls, buzzards) and snakes where permitted to the garden. Install perches for raptors.
• Repellents. Some gardeners use odorous substances (garlic infusion, peppermint, elderberry), but their effectiveness is limited, especially during heavy snowfall (Cornell Guide, 2003).

Important: use poisoned baits with caution in gardens where there are pets—they may be poisoned.

Hares and Rabbits

Hares (especially in northern regions) and rabbits eat bark and young shoots in winter at heights of up to 50–80 cm from the ground (Westwood, 1993). Their incisors leave characteristic oblique cuts on branches. The damage is usually not ring-shaped but multiple, which greatly weakens the tree and reduces winter hardiness.

How to protect:

• Wrapping the trunk. Use thick paper, jute burlap, or special plastic netting. Wrap to the entire height that hares can reach (usually 80–100 cm) and secure with twine or wire. Remove the wrap in spring to avoid bark rotting.
• Mesh fencing. Fence young trees with metal netting with a mesh size of no more than 3–5 cm. The netting should be 10–15 cm from the trunk and secured to stakes.
• Repellents. You can hang shiny ribbons, old CDs on the branches, or use odorous repellents (based on blood, garlic, pepper). However, hares quickly get used to them, so they need to be changed.
• Removing shelters. Remove piles of brushwood, dry grass, and deadwood where hares may hide.

Domestic Animals

Cows, goats, sheep, and even dogs can cause serious harm to a pear. Cattle can break branches, strip bark (especially when rubbing against the trunk), and goats and sheep readily eat young leaves and shoots if they have access to the garden (Cornell Guide, 2003). In addition, trampling and soil compaction in the trunk circle damage the roots.

Protection measures:

• Strong fencing. Be sure to fence the garden or at least the young trees. The fence height for cattle is at least 1.2–1.5 m; for goats and sheep, 1 m is sufficient, but with fine mesh.
• Trunk wrapping. To protect against bark abrasion (when animals rub), you can use metal netting or a wooden lattice around the trunk.
• Tethering. If there is no fencing, ensure that animals do not graze near the garden, especially in autumn when grass is scarce and branches seem like a treat.
• Dog training. Domestic dogs can hunt rodents, which is useful, but they can also damage bark by digging holes. Train dogs not to dig near trees, or install a low metal ring around the trunk.

Birds

Birds are the main enemies of the crop. Pears suffer especially from them when the fruit begins to ripen. Sparrows, thrushes, starlings, and other birds can peck and spoil a significant part of the fruit, not only in the current season but also damage buds and flowers (Cornell Guide, 2003; Buckingham, 2010).

Bird protection methods:

• Protective nets. The most effective method. Throw nets with a mesh size of 1.5–2 cm over the tree crown during fruit ripening (2–3 weeks before harvest). The net should be taut and not touch the fruit so birds cannot reach them through the mesh. Fix the net on a frame of sticks or branches to prevent sagging.
• Scare devices. Use shiny pinwheels, foil ribbons, old CDs, as well as special predator decoys—hawk decoys or kite silhouettes of predators (Cornell Guide, 2003). However, birds quickly get used to static scarecrows, so they need to be moved and combined periodically.
• Sound repellents. Electronic devices that play predator calls can be effective but may annoy neighbors and the gardeners themselves. You can also use firecrackers or ultrasonic generators, but their effectiveness is debatable.
• Feeding time. Feed birds away from the garden (if you do not want to attract them to the trees). It is best not to feed them at all during fruit ripening.
• Planting decoys. You can plant berry bushes near the garden (rowan, viburnum)—they will distract birds from the pears, but this does not guarantee complete protection.

Regional specifics:

• In southern regions, birds can be active year-round, so nets are recommended even in winter to protect buds from pecking.
• In regions with a large number of fruit crops (garden communities), birds fly in flocks, and only a comprehensive approach (nets + scare devices) yields results.

When to be especially careful:

• Young plantings in the first year—while the bark is soft, any gnawing is critical.
• In snowless winters, when rodents do not find natural food and are more active near trunks.
• During flowering and fruit ripening—peak bird activity.
• In areas with many hares (north, forest zones).

Brief summary of the chapter: Animals are a serious threat to pears, especially in winter and during crop ripening. The main protection is physical barriers: nets for trunks and crowns, wrapping, and fencing. Environmental control is equally important: cleanliness in the trunk circle, removing shelters for rodents and hares. The integrated use of mechanical, biological, and repellent means is the key to preserving the tree and the crop.

Late Spring Frosts

The pear blooms early, often earlier than the apple tree, so spring frosts are its main enemy (Rieger, 2010). Damaged flowers do not set fruit, and if frost catches the ovaries, the harvest can be completely lost. In some regions, such frosts occur every 3–4 years, so protection must be planned in advance.

How to protect a flowering pear:

• Delaying flowering. The most reliable way is to postpone flowering to a time when the threat of frost is minimal. For this:
• Whitewashing trunks (especially on the south side)—reflects sunlight, slows tissue warming, and consequently, bud opening (Westwood, 1993).
• Mulching with snow (or, conversely, compacting snow near the trunk)—slows soil and root thawing, which shifts the onset of vegetation (Cornell Guide, 2003).
• Sprinkling with water (fine mist irrigation) in the pre-flowering period—evaporation cools tissues, delaying opening by 7–10 days. This method is effective in regions with dry springs but can provoke fungal diseases in humid climates (Westwood, 1993).
• Sprinkling during frost. If frost has already set in, you can turn on fine mist irrigation above the crown. When water freezes, heat is released (80 calories per gram of ice), which protects flowers from damage. It is important that water is supplied continuously until the temperature rises above zero (Westwood, 1993). This is one of the most effective methods, but it requires an irrigation system and sufficient water reserves.
• Smoking (smudging). Burning wet materials (raw straw, pine needles, peat) in piles or smoke bombs creates a smoke screen that reduces heat loss from the soil and can raise the temperature near the ground by 1–2 °C (Westwood, 1993). The method works only in calm weather and in the presence of a temperature inversion (when warm air is above and cold air is near the ground).
• Heating. In small gardens, garden heaters, heat fans, or even braziers are used (you can use oil lamps or candles under covers). This is expensive but effective for especially valuable trees (Buckingham, 2010).
• Covering. Young trees or low-growing forms (on quince rootstock) can be completely covered with non-woven material (spunbond, agrotex) during frost. The cover is removed in the morning as soon as the temperature rises. For mature trees, this is labor-intensive, but for dwarf forms, it is quite feasible.
• Choosing varieties. The simplest and most reliable is to plant varieties with late flowering (e.g., some Ussuri pear varieties or hybrids). When establishing a garden, consider that cold air stagnates in low places (hollows, at the foot of slopes), and frosts are stronger there (Westwood, 1993).

What to do if frost has already damaged the flowers:

• Spray the trees abundantly with water before sunrise—slow thawing reduces tissue damage.
• Apply foliar feeding (urea 0.5% + micronutrients) to stimulate recovery.
• If only part of the flowers is damaged, the remaining ones can produce a crop, but it will be smaller. Do not rush into radical pruning—some ovaries may recover (Krivko, 2014).

Drought

The pear is considered relatively drought-resistant due to its deep root system, but prolonged lack of precipitation (especially during fruit growth and flower bud formation) greatly reduces yield and fruit quality (Rieger, 2010; Potapov et al., 2000).

Signs of drought in pears:

• Leaves lose turgor, become wilted and drooping.
• Shoot tips stop growing.
• Fruits become smaller, harder, and less sweet.
• Increased shedding of ovaries and fruits.

How to combat drought:

• Regular watering. In dry periods, pears need watering once every 7–10 days at the rate of 30–50 liters per mature tree. Water not superficially but deeply—water should soak the soil to 50–70 cm (the zone of main absorbing roots). It is better to use drip irrigation or furrow irrigation to avoid surface evaporation.
• Mulching. A thick layer of mulch (sawdust, bark, straw) 8–10 cm thick reduces soil evaporation by almost half and protects roots from overheating (Cornell Guide, 2003; see also Chapter 2). Renew mulch as it compacts.
• Shading. In particularly hot regions, you can use shade nets (20–30% shading), which reduce leaf temperature and reduce evaporation. However, do not overdo it—pears need a lot of sun for fruit ripening and flower bud formation.
• Crop load regulation. If the tree is overloaded with fruit, it spends almost all its water on them and can suffer more from drought. Therefore, timely thinning (of ovaries) not only improves fruit quality but also increases the overall resistance of the tree (Jackson, 2003).
• Choosing rootstock. In arid regions, pears on seed rootstocks (e.g., seedlings of common pear) are preferable—their root system is deeper and uses soil moisture better than trees on quince rootstock, which have shallow roots (Rieger, 2010).

Heat

High temperatures (above +30 °C) combined with bright sun can cause burns to bark, fruit, and leaves. In pears, as in apples, the optimal temperature for photosynthesis is 18–25 °C; when this is exceeded, respiration increases sharply, and the tree spends stored substances on maintaining vital functions rather than on fruit growth (Agustí, 2010; Potapov et al., 2000).

Protection from heat:

• Whitewashing the trunk and thick branches (especially on the south side) reflects sunlight, reducing bark temperature by 5–10 °C (Westwood, 1993). Do it in early spring, before intense sun sets in.
• Wrapping trunks with light non-woven material—for young trees. This is a temporary measure during periods of extreme heat.
• Irrigation (sprinkling) during the hottest hours—fine mist spraying reduces crown temperature through evaporation. This also helps with severe sunburn of leaves.
• Protecting fruit from sunburn. Brown spots appear on fruit—these are areas where the skin has been destroyed. In southern regions, shade nets are used, or more leaves are left on the fruit to create natural shade. Do not prune the crown heavily before the hot period—it is better to remove excess shoots after harvest (Krivko, 2014).
• Choosing varieties. There are pear varieties resistant to heat (e.g., 'Bartlett'—tolerates high temperatures well, especially in dry climates, Rieger, 2010). When buying saplings, check their suitability for your region.

Wind

Strong wind is not only a mechanical threat (breaking branches, damaging fruit) but also a factor that exacerbates drought and reduces pollination efficiency. In winter, wind contributes to shoot desiccation and reduced winter hardiness (Westwood, 1993).

Protection from wind:

• Protective windbreaks and hedges. Plant fast-growing trees or shrubs along the plot boundaries (e.g., poplar, willow, lilac, cotoneaster) that create a windbreak barrier. The distance to fruit trees should be at least 5–6 meters (Krivko, 2014). If the site is open, install a windbreak fence (picket fence, netting) with 30–40% gaps so that the wind is dispersed rather than reflected and creating turbulence.
• Proper crown shaping. Trees with a sparse, well-ventilated crown suffer less from wind than dense ones. Remove branches growing inward and those that create "windage" (long, leafless shoots).
• Stakes for young trees. Install stakes (see chapter on planting) and tie the trees for the first 3–5 years until the root system is established in the soil (Buckingham, 2010). This is especially important for trees on quince rootstock with shallow roots.
• Strengthening branches. Branches with narrow attachment angles (less than 45°) are weakly attached to the trunk and break easily in the wind. In young trees, bend them with spacers or weights, increasing the angle to 60–70°. This mechanically strengthens the attachment.

Hail

Hail can severely damage the crown and fruit. Even if the tree survives, wounds on the bark and fruit become gateways for rot and bacterial blight pathogens (Rieger, 2010).

Protection from hail:

• Protective nets. This is the most reliable but also the most expensive method. Nets with a mesh size of 5–10 mm are stretched over the crown on supports, protecting against hail and birds at the same time. It is especially recommended in regions with frequent hail events (southern steppes, foothills). Nets can be used permanently or temporarily—during the period when fruit is most vulnerable (Buckingham, 2010).
• Covering with non-woven material. In small gardens and for young trees, you can use agrospanbond or lutrasil, laid over the crown and secured against the wind. This protects against small hail, but large hail can tear the material.
• Using natural barriers. Planting tall protective trees (e.g., poplars) can intercept hail clouds, but effectiveness is debatable.
• After hail. After hail, be sure to:
• Remove all damaged fruit, even if green—they will rot and infect neighboring ones.
• Clean and treat wounds on the bark (with copper sulfate + garden paste).
• Apply foliar feeding (urea 0.3–0.5%) to stimulate regeneration.
• Treat with fungicides (e.g., Bordeaux mixture) to prevent infections (Krivko, 2014).

Brief summary of the chapter: Extreme weather events require a quick and adequate response. Protection from frost is primarily delaying flowering, sprinkling, and smoking. From drought—regular deep watering and mulching. From heat—protecting bark and fruit from burns. From wind—creating windbreaks and strengthening the crown. From hail—physical protection with nets, and after damage—sanitation of wounds. Success largely depends on the timeliness of actions and a comprehensive approach.

Assessing Winter Damage

The spring inspection is carried out in several stages, starting from early spring (as soon as the snow melts) and ending with the period of full leaf expansion. Some damage becomes noticeable only during active vegetation.

Inspection of bark and trunk:

• Frost cracks. Examine the trunk and bases of skeletal branches for cracks. Even small cracks require treatment. Pay attention to the southern and southwestern sides of the trunk—that is where burns and cracks from sharp temperature changes most often appear (Westwood, 1993).
• Sunburn. Appear as brown, dry, peeling areas of bark. If the bark peels off, there may be exposed wood underneath. First-degree burns (only superficial browning) usually heal on their own, but with deep cambium damage, the tree may die (Potapov et al., 2000).
• Gnawing. Examine the base of the trunk to a height of up to 1 m. Signs of rodents are characteristic scratches, bark stripping, sometimes down to the wood. If ring damage to the bark exceeds 50% of the circumference, nutrient transport is disrupted, and the tree will most likely die (Cornell Guide, 2003).
• Gummosis. In pears (unlike stone fruits), this is rarer, but with severe bark or root collar damage, drops of clear or amber liquid may appear. This is a sign of stress and tissue damage (Tarasov et al., 1981).

Assessment of bud and shoot condition:

• Degree of bud freezing. To assess, cut several branches from different parts of the crown (from the upper, middle, and lower zones) and place them in water in a warm room. If after 5–7 days the buds open and produce normal green shoots—all is well. If the buds do not open or the shoots are weak and brown, the buds have been damaged by frost (Tarasov et al., 1981). This method is called "forcing" (Krivko, 2014).
• Wood damage. On a cross-section of a branch, assess the color of the wood:
• Light, white or cream—healthy tissue.
• Light brown—slight freezing (individual cells damaged, but the tree will recover).
• Dark brown—significant freezing (conducting tissues damaged, the branch may die).
• Black—complete tissue death (such branches are removed) (Tarasov et al., 1981).
• Last year's shoots. If annual growths have dry or blackened tips—this is a sign of frost desiccation or low-temperature damage. Cut them back to a living bud.

Examination of the root system (for severely affected trees):

• If the tree shows no signs of life, carefully dig out a section of roots to a depth of 15–20 cm. Living roots are white or light yellowish on the cut. Dead ones are dark brown, dry, and break easily.
• Pear roots, especially on clonal rootstocks, are less frost-resistant than the above-ground part (Westwood, 1993). In snowless winters, they can freeze, which manifests as delayed bud break and weak growth in spring.

Assessment of the overall degree of freezing (on a scale for pome fruits):

• 0 points—no damage.
• 1 point—very slight: slight yellowing of wood, isolated dried shoot tips, up to 10% of damaged fruit formations (Tarasov et al., 1981).
• 2 points—slight: bark light brown, freezing of annual growths and small branches, death of up to 25% of fruit formations (Tarasov et al., 1981).
• 3 points—significant: wood brown, semi-skeletal and some skeletal branches damaged, death of up to 50% of fruit formations (Tarasov et al., 1981).
• 4 points—severe: wood dark brown, deep bark damage, up to 75% of fruit spurs and a significant part of the crown died (Tarasov et al., 1981).
• 5 points—the tree is dead (Tarasov et al., 1981).

Recovery Measures

Depending on the extent of damage, you can choose one or more of the following techniques.

Sanitary pruning:

• Removing dead branches. Branches with dark wood, dry buds, and no signs of life (no green bark on incision) are cut "on the ring." Do not leave stubs—they will become a source of infection.
• Pruning frozen shoots. If the apical part of the shoot is damaged but the lower part is alive, prune the shoot to the first healthy outward-facing bud (Krivko, 2014).
• Pruning with transfer to a lateral branch. If a skeletal branch is damaged, it can be pruned to a side branch that will take over the role of the leader. This is called "transfer" and allows you to maintain the crown shape (Krivko, 2014).
• Timing. Sanitary pruning is carried out before sap flow or at its beginning, when the boundaries of damaged tissues are clearly visible (Tarasov et al., 1981). Do not rush into radical pruning in April—let the tree show what has actually died; some buds may open with a delay of 2–3 weeks (Krivko, 2014).

Treating wounds on the trunk and branches:

• Cleaning. Using a sharp garden knife, clean the edges of cracks, abrasions, and burns to healthy tissue. Remove loose bark, smooth out irregularities. Tools should be clean and sharp (disinfect with alcohol or a 1% potassium permanganate solution).
• Disinfection. Rinse the wound with a 1–2% copper sulfate solution or a 3% iron sulfate solution. This will prevent fungi and bacteria from entering.
• Sealing. Apply garden paste or a special paste (e.g., "Ranet," "BlagoSad") to the entire cleaned surface. The paste should be elastic and not crack with temperature changes (Krivko, 2014).
• Wrapping. For large wounds, after treatment, apply a clean burlap or light non-woven material on top to protect from direct sunlight and speed up healing.

Crown restoration (for severe damage):

• Removing the dead central part. If the central leader is dead (or severely damaged) but skeletal branches are alive, choose one of the strongest side branches and direct it vertically, turning it into a new leader. Prune the other branches, subordinating them to the new leader (Krivko, 2014).
• Rejuvenating pruning. If annual growth was less than 20–25 cm, this is a signal for rejuvenating pruning. Carry it out on perennial wood (on 3–4-year-old branches), stimulating the growth of new strong shoots (Krivko, 2014; Jackson, 2003).

Watering and fertilizing for recovery:

• In early spring, as soon as the soil thaws, apply a complete complex fertilizer (nitrogen, phosphorus, potassium in a 1:1:1 ratio) to stimulate the growth of new shoots. Dose—30–50 g per 1 m² of the trunk circle.
• Foliar feeding (on leaves) with urea (0.5%) + micronutrients (zinc, manganese, boron)—helps the weakened tree to restore its leaf apparatus faster (Rieger, 2010).
• Watering. Provide regular watering in spring and early summer if precipitation is insufficient. Recovery requires enhanced water and nutrient intake.
• Mulching and loosening. For better warming of the roots and air access—loosen the soil in the trunk circle. Mulch will retain moisture and prevent weed growth.

Protection from diseases and pests:

• Weakened trees are especially vulnerable to infections (bacterial blight, scab, moniliosis). Treat the crown with Bordeaux mixture (3%) before bud break and 1% Bordeaux liquid on the green cone (Cornell Guide, 2003; Rieger, 2010).
• During flowering, weakened trees are more susceptible to bacterial blight. If there is a risk of this disease in your region, treat with streptomycin (according to instructions) or copper-containing preparations (Rieger, 2010).
• Monitor the appearance of pests (codling moth, aphids, pear mite)—they multiply faster on weakened trees.

When the Tree Will Recover on Its Own

Not all damage requires intervention. In some cases, it is enough to give the tree time and provide basic care.

The tree will recover on its own if:

• Damage is rated at 1–2 points. The tree will produce normal growth, restore the crown, and set flower buds for next year's crop (Tarasov et al., 1981).
• The tips of annual shoots (no more than 1/3 of the length) have frozen. Pruning is not necessary—new shoots will grow from the lateral buds in spring, and the dead tip will dry out and fall off.
• There are isolated sunburn marks on the bark (not ring-shaped). The tree will cover them with new bark within 1–2 years, especially with good care (Westwood, 1993).
• Individual fruit buds (no more than 25–30%) are damaged. This is natural regulation: the tree itself sheds excess ovaries, and the current year's crop may even be of higher quality (Jackson, 2003).

What to do if the tree is severely damaged (3–4 points):

• Do not remove the tree immediately. Even with severe damage, some pears produce abundant growth from dormant buds at the base of the trunk. If the root system is alive and the grafting point is preserved, a new tree can be formed from this growth (Krivko, 2014).
• Give it time. During the first half of summer, closely monitor development. Sometimes damage only manifests in June—this may be growth retardation or sudden branch dieback. Do not rush to uproot (Tarasov et al., 1981).
• Focus on "replacement shoots." If the trunk or main skeletal branches have died, but strong "water sprout" shoots (vigorous vertical shoots from old wood) have emerged from dormant buds, they can be used to build a new crown (Krivko, 2014).
• Recovery period. With 3-point damage, 2–3 seasons are required for crown and yield restoration. With 4-point damage—4–5 years, and not always successfully. In any case, make the decision about preserving or replacing the tree no earlier than the second half of summer (Tarasov et al., 1981).

When to remove the tree:

• 5 points—the above-ground part is completely dead (wood black, bark peeled off, dormant buds do not awaken). This usually occurs with a combination of several unfavorable factors: severe frost + dry autumn + rodent damage.
• Ring damage to the bark of more than 50% of the trunk circumference. Even if the tree survives, a constriction will form at this spot, growth will be stunted, and yield will drop. Remove and plant a new tree (Cornell Guide, 2003).
• Multiple frost cracks and burns on all skeletal branches. Restoring such trees is economically unfeasible even in an amateur garden—it is easier to replace (Westwood, 1993).

Brief summary of the chapter: Spring inspection of a pear is a systematic diagnosis of the bark, buds, shoots, and roots. Use the "forcing" method of branches in water to assess bud viability. For 1–2 point damage, sanitary pruning and enhanced care are sufficient. For 3–4 points, a set of recovery measures is required: wound cleaning, pruning to healthy wood, fertilizing, and disease protection. At 5 points and ring damage to the bark, the tree, unfortunately, should be removed. The main thing is not to rush to conclusions; give the tree at least one season to recover before making a final decision.