Blackberry
Symptom Cause  
Stem tips die; oval spots with purple edges, gray centers on canes
Anthracnose (on plants)
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Leaves wrinkled or curled; discolored, stunted, tend to fall off
Aphids
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Fruit missing; purple bird manure
Birds
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Small holes in canes surrounded by sawdust
Borers
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Very young canes cut off at soil level
Cutworms
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Plants disappear all or in part; growing cane tips chewed off
Deer
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Areas between veins turn yellow/brown; Leaves have white, purple/black growth
Downy Mildew
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Small misshapen fruits
Fruit Fly Larvae
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Soft, watery spots appear on stems, leaves or fruit; fuzzy white or gray mold forms.
Gray Mold (Botrytis Blight)
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Holes in leaves
Japanese Beetles
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Foliage yellowed or white mottling, glaze of honeydew; plant weakens
Leafhoppers
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Holes in fruit; leaves rolled up
Leafrollers
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White spots on leaves; eventually entire leaf is covered with powder
Powdery Mildew
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Leaves yellowed and may drop
Psyllids
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Plants grow slowly; stunted; edge of leaves chewed
Root Weevils
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Orange or brown pustules on leaves
Rust (on plants)
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Weaken plant, stunting growth, fewer blooms and fruit.
Sawflies
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Leaves yellow, drop; bumps on leaves and stems; sometimes sticky leaves
Scale
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Leaves stippled, yellow, dirty; webbing on interior canes
Spider Mites
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Leaves discolored; black fecal spots on underside of leaf.
Thrips
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Yellowing of foliage and gradual defoliation; plants may become stunted
Verticillium Wilt
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Weakened plant, leaves yellowed, appears like flying dandruff when moved
Whiteflies
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