NOCTI Horticulture Practice Test

Sunscald describes tissue injury that happens when a plant surface is heated by sun and the rapid temperature change causes cellular damage due to water movement within the tissue. This often occurs on sun-exposed areas like thin-barked trunks, exposed fruit skins, or uncovered branches, especially after cold spells or during bright, hot conditions. The affected spots look pale or sunburned, and can become corky or crack as the tissue heals. This term specifically captures damage from sun exposure and temperature effects, unlike translocation (the movement of substances within the plant), root rot (a disease caused by soil pathogens), or scarification (a seed dormancy-breaking treatment). To prevent sunscald, protect exposed surfaces with shading, trunk wrapping, or reflective coatings, and aim for steady moisture to reduce stress on the tissue.