Why are my tree's leaves turning brown or dropping in summer?

Leaves often brown at the edges when a tree is short of water. Hot, dry spells, compacted soil or damaged roots can all cause it. A heavy leaf drop in summer can be the tree trying to save water.

Spots on leaves can be from fungus, especially in wet spring weather. Many leaf spots look bad but do little harm to a mature tree. Other problems, like a wilting branch, brown leaves on one side or a pest at work, can be more serious.

First check how dry the soil is. A deep, slow watering often helps drought-stressed trees. Then look for other clues: bark damage, mushrooms, insects, recent digging or construction near the roots.

If you are unsure, take photos and contact your county extension office or a certified arborist before you spray anything.