Maple Leaf Galls: Identify Before Replacing Tree

Leaf galls on maple are caused by mites, insects, or fungi—specific ID determines if Japanese maple will be affected. Most are cosmetic, not fatal.

Action

1. Contact local Cooperative Extension Master Gardener program with photos/sample.
2. Search "maple leaf galls" + your state for common types.
3. Common: Maple bladder gall (mite), gouty vein gall (midge), eyespot gall (midge).

Replanting

• If mite gall: Japanese maple may also get it (same pest).
• If insect gall: Host specificity varies.
• Soil treatment rarely helps—gall makers live on leaves.

Get ID first. Many galls need no treatment.