Overexposure to sun causes sunscald. The problem commonly occurs when young trees are moved from a protected situation, such as a shaded nursery, to an open garden site. Trees that have been shaded have thin and tender bark.
Sunscald often is called southwest injury because it most often occurs on the southwest side of young tree trunks. In Colorado, it primarily occurs from December through March on young, thin-barked, deciduous trees.
Sunscald is a winter time injury to tree trunks, caused by the sun. Deciduous trees are without leaves, night temperatures often fall below freezing and the winter sun is low in the sky. These factors combine to cause sunscald.
Sunscald: Cracking or splitting of tree trunks and large branches caused by the sun warming them during the winter. Also damage caused by the sun to some vegetables such as peppers.
Sunscald A burning of tissue due to strong light on foliage or bark.
Superficial On the surface, not connected to inner tissues.
Supine Lying flat, face upwards.
sunscald Winter or summer injury to the trunk of a woody plant caused by hot sun and fluctuating temperatures. Typically, sunscalded bark splits and separates from the trunk.
surfactant See additive.
Sunscalding can ruin the appearance of fruits such as persimmons or loquats. When thinning susceptible species, cull from the outside of the tree so that the ones remaining ripen farther inside where foliage will shade them.
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Young trees are susceptible to sunscald during winter months, a problem caused by wide fluctuations in temperature. For instance, during the day if the sun is shining, bark temperatures will rise higher than air temperatures.
They can only enter the cambium layer through openings created by mechanical damage, diseases, sunscald, winter injury, etc.
Most rhododendrons including the Carolina rhododendron will bloom more abundantly in full sun if the soil is kept moist, but sunscald and winter desiccation problems may cause foliage and bud problems.
Leave a few suckers on the middle and top of the plant to protect the fruit from sunscald, especially if you live in a hot, sunny area, such as in the South. Sunscald produces light gray patches of skin that are subject to disease.
Young trees and evergreen woodies, like boxwoods, which are susceptible to sunscald, will especially benefit from a burlap screen.
Some young trees need extra protection during the winter from a condition called "sunscald." Sunscald.
How to Plant an Autumn Garden
With a little careful planning, your garden can be a blooming showcase from spring through.
Because you don't prune them, caged tomatoes develop enough foliage to provide adequate shade for ripening fruit and to protect the fruits from sunscald.
Cut them to about a foot long and replant lengthwise in a moist location. Cover lightly with soil to prevent sunscald. (Covering with mulch has been suggested to conserve water, if they're not planted directly into a pond.) ...
so, then watering two or three times a week for another couple of months, or during dry weather. In the late fall, paint the tree bark with white latex paint diluted with water, so the bark will reflect winter sunlight and not be damages by sunscald ...
As this coating washes off with rain, the plant becomes more vulnerable to sun damage as the growing season progresses. Brown, scorched leaf surfaces or leaf tips on a hosta is a symptom of sunscald.
 See also: Plant, Scald, Water, Spring, Soil
  
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