Winter drought coupled with low temperatures can cause extensive die back or death. In rainy seasons this disease may be serious on silver maples and Japanese maples. Many spots occur along the veins. Areas often enlarge killing the entire leaf. Leaves partially killed appear as if scorched.
Many infected leaves drop in late spring.
Twigs may die back. Collect and destroy fallen leaves. Spraying with a recommended fungicide when buds begin to unfold in the spring and again in 10 to 20 days will help prevent infection. Foliage appears bronzed, dried and scorched. Water trees during summer droughts.