Silver Maple Leaf Galls: Harmless Cosmetic Issue

What They Are

Green/black sac-like growths are galls induced by mites or insects. Brown spots are the leaf's reaction.

No Action Needed

• Galls form in spring; once visible, the pest is protected inside.
• Tree health is unaffected; vigor not reduced.
• No effective spray once galls appear.

Outlook

Ignore them. They may vary year to year but never threaten the tree.