Bean, Snap
Symptom Cause  
Water-soaked spots on pods; stems; dark red, sunken spots on leaves and stems; pinkish red spots on pods
Anthracnose (on plants)
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Leaves wrinkled or curled; discolored, stunted, tend to fall off
Aphids
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Leaves, stems and buds eaten
Armyworms
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Plants wilt quickly; white, sticky material might be seen when a stem is cut
Bacterial Wilt
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Holes in leaves
Corn Earworms
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Holes chewed in leaves, leaf stalk, stems; plant wilts, dies.
Cucumber Beetles
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Curled; twisted leaves
Curly Top
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Seedling cut off at soil
Cutworms
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Plants Disappear All Or In Part
Deer
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White Powder On Leaf Undersides; Foliage Wilts
Downy Mildew
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Leaves riddled with shot holes; weak plant
Flea Beetles
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Yellowing of foliage, gradual defoliation,
Fusarium Wilt
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Holes in leaves and flowers
Japanese Beetles
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Foliage yellowed or white mottling, glaze of honeydew; plant weakens
Leafhoppers
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Leaves are skeletonized
Mexican Bean Beetles
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Leaves stippled, yellowing or bronze; dry out and drop may be webbing visible; sometimes galls form on leaves
Mite
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Leaves mottled bright yellow and green; leaves are distorted; raised dark areas; plant stunted
Mosaic Viruses
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Plant stunted, leaves yellowed, root lesions
Nematodes
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Fail to set pods
Over-Mature Pods
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Leaves look scorched or bronzed
Ozone Pollution
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Seeds sprout but fail to leaf out
Physical Injury
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Foliage Yellowed Or White Mottling, Glaze Of Honeydew; Plant Weakens
Potato Leafhoppers
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Leaves Coated With White Powdery substance
Powdery Mildew
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Plants Disappear All Or In Part
Rabbits
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Orange-tinged spots under leaves; leaves rapidly yellow, dry up, and drop
Rust (on plants)
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Ragged holes in middle of leaves
Slugs
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Leaves discolored; black fecal spots on underside of leaf.
Thrips
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Fail to set pods
Too Hot
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Seedlings leggy and weak
Too Much Shade
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Fail to set pods
Too Much Water
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Weakened plant, leaves yellowed, appears like flying dandruff when foliage disturbed
Whiteflies
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Plants Disappear All Or In Part
Woodchucks
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