Symptom: Leaves have jagged, open spaces between their main veins.
Cause: When spring leaf buds are expanding, a sudden frost can kill the whole bud or the tip of the bud. Injured leaves may suddenly turn brown or black a day or two after the frost. When an expanded bud is injured by frost, leaves that emerge have a torn or tattered appearance because portions of the leaf tissues are dead.
Control: There are no practical means of preventing frost damage.