Diagnosing Leaf Scorch on Apple and Peach Trees

Granny Smith apple and peach trees develop leaves that turn brown/black, resembling "bad potato chips." Malathion and Sevin dust failed.

Need for Visual Diagnosis

Description suggests possible fungal leaf spot, bacterial scorch, or environmental scorch—but "bad potato chip" appearance is nonspecific. Critical questions:

• Are both species affected identically?
• Do symptoms start at branch tips?
• Can photos be provided?

Likely Directions

If both species show similar symptoms, consider abiotic factors (heat, drought, herbicide drift). If species-specific, investigate host-specific pathogens (apple scab, peach leaf curl). Fungicide/insecticide sprays without diagnosis waste effort and may harm beneficials.

Submit clear photos of affected foliage, whole tree, and base for accurate identification.