Sun Scald
Western Pennsylvania’s climate often causes “sun scald,” which occurs when the plant tissue is frozen-usually overnight-and then the sun heats the tissue and thaws it out. When the temperature drops below freezing again-usually when the sun goes down-and the cycle keeps happening over several days, sun scald can occur.The signs of sun scald include browning or blackening leaves, split bark, and a plant that looks as though it is in distress.