Powdery Mildew
Podosphaera aphanis

• Light green blotches develop on the upper surface of the leaves
• White patches may develop on leaf surfaces and fruit
• Young leaves curl inward
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Tomato Ringspot Virus and Mosaic Virus

• Light to dark green mottling of leaves

• Leaves may be deformed, blistered, or misshapen
• Plants show a progressive stunting of growth and poor yield
• Fruits on infected bushes are small and crumbly
• General decline in the cane vigor and fruit production

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Spider Mites
Tetranychus urticae

• Feeding on the underside of leaves causes a “russet” appearance to the leaves; leaves may become distorted
• In heavy infestations, webbing can be found on underside of leaves
• Adult spider mites are very small (approximately 1/50 inch in length), and are yellow to dark crimson, with dark spots
• Mites usually appear in late June-August; more prevalent in hot, dry weather
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Nutrient Deficiency

• Leaves turn yellow to white, often veins remain green
• Canes show a general decline in vigor over time

Yellow Rust and Orange Rust
Arthuriomyces peckianus and Phragmidium rubi-idaei

• Yellow or orange powdery spores on lower leaf surface
• Orange rust only affects black raspberry
• Yellow rust only affects red raspberry
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Herbicide Injury

• Leaves appear yellow or bleached
• Distorted and twisted leaves, margins of the leaf are often cupped upward

Potato Leafhopper
Empoasca fabae

• Leaves appear wrinkled from leafhopper feeding; may have a yellow tinge to the leaves
• Feeding may stunt the plant, resulting in a reduced yield
• Potato leafhopper adults are lime green, slender, small (⅛ inch long), and wedge-shaped
• Leafhoppers are present from June-August