Plant disease photo library

Looks like: Brown spots with concentric rings (bullseye) on the oldest, lowest leaves first. Yellow halo around each spot; leaves brown out and drop from the bottom up.

Common on: Tomato, Potato, Eggplant

Looks like: Greasy, gray-green water-soaked blotches on leaves and stems that turn brown-black fast, often with white fuzz on the leaf underside in the morning. Firm brown patches on fruit.

Common on: Tomato, Potato

Looks like: Many small round spots with dark borders and pale gray centers, peppered with tiny black dots. Starts low and works upward.

Common on: Tomato

Looks like: White talcum-powder patches on the top of leaves that spread until the leaf yellows and dries. Rubs off with a finger.

Common on: Squash, Cucumber, Melon, Pumpkin, Beans, Peas, Zinnia

Looks like: Angular yellow patches on the upper leaf, bounded by veins, with gray-purple fuzz underneath in humid mornings. Basil leaves yellow between the veins and curl.

Common on: Cucumber, Basil, Lettuce, Spinach, Melon

Looks like: A sunken, leathery black-brown patch on the bottom (blossom end) of the fruit. The plant itself looks fine.

Common on: Tomato, Pepper, Squash, Eggplant, Watermelon

Looks like: One side or one branch of the plant wilts in the heat and never fully recovers overnight. Leaves yellow from the bottom, often on just one side. Cut the stem: brown streaks in the inner tissue.

Common on: Tomato, Basil, Melon, Cucumber, Banana

Looks like: V-shaped yellow wedges from the leaf edge inward, wilting on hot afternoons, stunted growth. Brown vascular streaking inside the stem.

Common on: Tomato, Eggplant, Strawberry, Maple, Potato

Looks like: Small dark water-soaked spots, sometimes with a yellow halo, that dry into ragged holes. Fruit gets raised scabby specks.

Common on: Pepper, Tomato, Lettuce, Beans

Looks like: Sudden wilting of whole vines while leaves stay green. Cut a wilted stem, press the halves together and pull apart — a sticky white thread strings between them.

Common on: Cucumber, Melon, Squash

Looks like: Mottled light-and-dark green marbling, puckered or strappy distorted new leaves, stunted growth, mottled fruit.

Common on: Tomato, Cucumber, Squash, Pepper, Beans

Looks like: Upward-cupped, thickened, leathery leaves with purple veins; plant stops setting fruit and stays stunted.

Common on: Tomato, Pepper, Beans

Looks like: Seedlings flop over with a pinched, water-soaked thread-thin stem right at the soil line. Sometimes white mold on the mix surface.

Common on: All seedlings

Looks like: Sunken circular dark spots on ripe fruit that ooze pink spore masses in humidity; dark lesions on bean pods.

Common on: Tomato, Pepper, Beans, Cucumber, Strawberry

Looks like: Fuzzy gray-brown mold on flowers, fruit and dying tissue; berries turn to soft mush overnight.

Common on: Strawberry, Tomato, Lettuce, Peony, Grape

Looks like: Raised orange, rusty-brown or yellow pustules on the leaf underside that smear orange on your finger; leaves yellow and drop.

Common on: Beans, Garlic, Onion, Hollyhock, Roses, Mint

Looks like: Plants wilt on warm days and stay stunted and purple-tinged; pull one up and the roots are swollen into knobby clubs.

Common on: Cabbage, Broccoli, Kale, Turnip, Radish

Looks like: Stunted, midday-wilting plants that never thrive despite good soil; roots covered in beadlike galls, carrots forked and hairy.

Common on: Tomato, Carrot, Cucumber, Okra, Pepper

Looks like: Winding pale tunnels or blistered tan patches sandwiched inside the leaf; you can see the larva as a speck at the end of the trail.

Common on: Chard, Spinach, Beet, Tomato, Citrus

Looks like: Fine yellow stippling or a bronzed, dusty look on leaves, with delicate webbing in leaf joints. Worst in hot, dry, dusty conditions.

Common on: Tomato, Cucumber, Beans, Melon, Houseplants

Looks like: A pale, papery, sunken white-tan patch on the sun-facing side of the fruit, which later molds over.

Common on: Tomato, Pepper, Squash

Looks like: Uniform pale yellowing starting with the OLDEST bottom leaves; plant is small and slow with thin stems.

Common on: Most vegetables, Corn, Greens

Looks like: Yellow leaves with sharply green veins, on the NEWEST growth first — an unmistakable green-net pattern.

Common on: Citrus, Blueberry, Roses, Squash

Looks like: Corky bumps, blisters or water-warts on leaf undersides and stems that later turn rust colored.

Common on: Tomato seedlings, Geranium, Brassicas, Succulents

Looks like: Twisted, cupped, strappy fern-like new growth with parallel veins; stems curl. Often affects everything on one side of the yard.

Common on: Tomato, Grape, Beans, Peppers

Looks like: Black spots with fringed, feathery margins on the leaf, surrounded by yellow; leaves drop until the cane is bare.

Common on: Roses

Looks like: Branch tips suddenly blacken and bend into a shepherd's crook, as if scorched; leaves stay attached. Amber ooze on cankers.

Common on: Apple, Pear, Quince, Loquat

Looks like: New spring leaves thicken, pucker and turn red-purple, then whiten and drop.

Common on: Peach, Nectarine

Looks like: Blotchy, asymmetric yellowing that ignores the vein pattern, lopsided bitter fruit that stays green at the bottom, heavy fruit drop.

Common on: Citrus

Looks like: Cottony white growth on stems near the soil, with hard black seed-like bodies inside; the stem rots through and the plant collapses.

Common on: Beans, Lettuce, Cabbage, Sunflower

Looks like: Older leaves roll upward into tubes but stay firm, green and healthy; the plant still flowers and fruits normally.

Common on: Tomato

Looks like: Fruit pinched at one end, curled, or bitter tasting near the stem.

Common on: Cucumber, Squash, Melon