injury to bark tissues on the trunk and branches caused by rapid changes in temperature. especially on warm days and cool nights in winter (contrast with scorch).
Merriam-Webster Online Dictionarysunscald (noun)
an injury of woody plants (as fruit or forest trees) characterized by localized death of the tissues and sometimes by cankers and caused when it occurs in the summer by the combined action of both the heat and light of the sun and in the winter by the combined action of sun and low temperature to produce freezing of bark and underlying tissues
« Back to Glossary Index
This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (May 2014) (Learn how and when to remove this template message)
Sun scald is the freezing of bark following high temperatures in the winter season, resulting in permanent visible damage to bark. Fruits may also be damaged. In the northern hemisphere, it is also called southwest injury.