Celery
Symptom Cause  
Leaves wrinkled or curled; discolored, stunted, tend to fall off
Aphids
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Leaves curl, yellow or brown, brittle
Beet Leafhopper
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Greenish or water-soaked spots on leaves; sunken lesions possible on stalks;
Blight, Early
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Greenish or water-soaked spots on leaves; sunken lesions possible on stalks;
Blight, Late
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Holes in leaves
Cabbage Loopers
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Young plant wilts, turn yellow die; maggots feeding on roots
Cabbage Maggots
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Holes eaten in leaves and stalks; rolls the leaf and ties it with webbing; silvery color
Celery Leaftier
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Leaves chewed
Celery Worm
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Young plant severed at soil
Cutworms
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Plants disappear all or in part
Deer
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Tunnels in stalks
European Corn Borers
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Reddish tissue on stalks and leaves; yellowing of foliage
Fusarium Wilt
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White butterflies; ragged holes in leaves, bit of green excrement on leaves
Imported Cabbageworms
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Roots have surface tunnels
Larvae of Carrot Rust Flies
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Leaves spotted; turn brown; fall
Leaf Spot
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Plants stunted, yellow
Nematodes
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Leaves chewed
Parsleyworms
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Blossom heads webbed, burrows in flower stem
Parsnip Webworm
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Water-soaked spots on stalks; bitter-tasting, rotted stems;
Pink Rot
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Tiny, black hopping insect, shot holes in foliage
Potato Flea Beetles
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Plant chewed to soil
Rabbits
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Ragged holes in leaves, often in middle
Slugs
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Leaves, stems and buds eaten
Southern Armyworms
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Leaves stippled, yellowing or bronze; dry out and drop may be webbing visible; sometimes galls form on leaves
Spider Mites
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Black spots, pitting on stem tips, buds, fruit
Tarnish Plant Bugs
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Leaves discolored; black fecal spots on underside of leaf.
Thrips
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Plant chewed to soil
Woodchucks
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