Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Chestnut blight is a destructive fungal canker disease caused by Cryphonectria parasitica. It attacks the inner bark and cambium of chestnut stems and branches,…
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White pine blister rust is a serious, often fatal fungal disease of five-needled white pines caused by Cronartium ribicola. It produces yellow-orange spots and…
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The spotted asparagus beetle, Crioceris duodecimpunctata, is a reddish-orange leaf beetle marked with twelve black spots. Adults chew tender asparagus spears and fern growth,…
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The asparagus beetle, Crioceris asparagi, is a chewing leaf beetle that feeds almost exclusively on asparagus. Adults attack emerging spears, causing brown scars, hooked…
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The brown garden snail, Cornu aspersum, is a nocturnal, plant-feeding land snail that damages vegetables, fruit, seedlings, ornamentals, and young trees. It chews irregular…
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Swede midge, Contarinia nasturtii, is a tiny invasive fly whose larvae feed on the growing points of cabbage-family crops. Injury causes puckered, swollen or…
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Grape white rot is a fungal disease of grapevines caused primarily by Coniella diplodiella. It most often damages ripening clusters after hail, insect injury,…
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Cucurbit anthracnose is a fungal disease caused by Colletotrichum orbiculare. It affects cucumber, muskmelon, watermelon, squash, pumpkin and related cucurbits, producing tan to dark…
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Bean anthracnose is a seedborne fungal disease caused by Colletotrichum lindemuthianum. It primarily affects snap, dry, lima, runner and related beans, producing brick-red to…
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Colletotrichum gloeosporioides is a fungus historically associated with anthracnose, fruit rot, dieback and postharvest decay on many plants. Modern DNA studies show that the…
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Black dot disease is a soil- and tuber-borne fungal disease caused by Colletotrichum coccodes. It is best known on potato, where it produces black…
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