Eggplant
Symptom Cause  
Small, dark spots on leaves; eventually leaves turn black; fruits may blacken/drop
Anthracnose (on plants)
>
Leaves wrinkled or curled; discolored, stunted, tend to fall off
Aphids
>
Plants wilt quickly; white, sticky material might be seen when a stem is cut
Bacterial Wilt
>
Irregular, water-soaked spots may develop on leaves; plant becomes partly defoliated; stem end of fruit becomes grayish-green; blossoms or young fruits may drop
Blight, Early
>
Irregular, water-soaked spots may develop on leaves; plant becomes partly defoliated; stem end of fruit becomes grayish-green; blossoms or young fruits may drop
Blight, Late
>
Flowers, leaves, roots chewed
Blister Beetles
>
Holes chewed in leaves
Colorado Potato Beetle
>
Leaves riddled with shot holes; plant weakens
Flea Beetles
>
Brownish spots on leaves; damage during wet weather/fruit has small/tan cankers
Fruit Rot
>
Tip of leaves brown, internal larvae trails visible. Leaves skeletonized and rolled up.
Leaf Miners
>
Septoria and Stemphylium
Leaf Mold
>
Foliage yellowed or white mottling, glaze of honeydew; plant weakens
Leafhoppers
>
Mottled, crinkled foliage; brown specks appear on fruit, and plants may droop and die prematurely
Mosaic Viruses
>
Plant stunted, leaves yellowed, lesions on roots
Nematodes
>
White spots on leaves; eventually entire leaf is covered with powder
Powdery Mildew
>
Ragged holes in middle of leaves
Slugs
>
Leaves stippled/yellow/bronze/dry out/Drop. Webbing visible; leaf galls
Spider Mites
>
Leaves skeletonized
Tomato Hornworm
>
Yellowing of foliage and gradual defoliation; plants may become stunted
Verticillium Wilt
>
Weakened plant, leaves yellowed, appears like flying dandruff when foliage disturbed
Whiteflies
>