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White powdery growth on leaves and stems; leaves may turn yellow and die.

Pustules of reddish or orange spores; can cause defoliation.

Dark, sunken lesions on fruits, leaves, or stems; distorted growth.

Wilting and yellowing leaves; brown discoloration in plant's vascular tissue.

Circular brown spots with concentric rings on leaves and stems; can lead to defoliation.

Curled or twisted leaves; stunted growth, reduced yield.

White powdery film on grape leaves, stems, and fruit; can lead to fruit cracking.

Yellow spots on upper leaves, fluffy white or grey growth underneath; stunted growth.

Leaf or fruit spots, wilting, rot; often leading to complete decay.

Yellowing leaves, often beginning at the bottom of the plant; wilting despite moist soil.

Dark, water-soaked spots on leaves and stems; white fungal growth under high humidity.

Swelling and distortion of roots, resulting in stunted plant growth and yellowing of leaves.

Raised lesions on leaves, fruit, and stems; fruit drop and defoliation.

Yellowing and wilting, often starting with one branch or side of the plant; brown vascular tissue.

Blackened branches and twigs resembling fire damage; ooze from cankers may be present.

Stunted growth, yellowing leaves, cysts on roots; reduced yield.

Olive green to black spots on apple leaves and fruit; can cause fruit deformation.