Pest
California red scale
Aonidiella aurantiiCalifornia red scale, Aonidiella aurantii, is a sap-feeding armored scale insect that most seriously affects citrus in warm regions of the United States. Immobile…
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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Pest
Strawberry blossom weevil
Anthonomus rubiThe strawberry blossom weevil (Anthonomus rubi) is a small Eurasian weevil that attacks berry crops by feeding on young foliage and unopened flower buds.…
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Pest
Apple Blossom Weevil
Anthonomus pomorumThe apple blossom weevil, Anthonomus pomorum, is a flower-bud-feeding weevil primarily associated with apple trees. Adults emerge from overwintering sites in early spring, feed…
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Disease
Early blight
Alternaria solaniEarly blight is a widespread fungal disease of tomato, potato and other nightshades caused by Alternaria solani. It usually begins on older, lower leaves…
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Disease
Purple Blotch
Alternaria porri (Ellis) CiferriPurple blotch is a fungal leaf disease of onions and related Allium crops caused by Alternaria porri. It begins as small, water-soaked or whitish…
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Disease
Alternaria leaf blight of carrot
Alternaria dauciAlternaria dauci causes carrot Alternaria leaf blight, a fungal disease that usually begins as small brown to black spots with yellow margins on older…
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Disease
Alternaria leaf spot of brassicas
Alternaria brassicae (Berk.) Sacc.Alternaria brassicae is a fungal pathogen associated with Alternaria leaf spot, also called black spot or gray leaf spot, on brassica crops. It produces…
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Disease
Alternaria leaf spot and fruit rot
Alternaria alternataAlternaria alternata is a widespread, opportunistic fungal pathogen that causes leaf spots, blights, stem lesions and fruit rots on numerous crops and ornamentals. Symptoms…
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Pest
Woolly whitefly
Aleurothrixus floccosusWoolly whitefly, Aleurothrixus floccosus, is a sap-feeding insect that primarily attacks citrus and may also occur on Eugenia. Immature stages live on leaf undersides…
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Disease
White Rust of Crucifers
Albugo candida (Pers.) KunzeWhite rust, also called white blister rust, is an oomycete disease of cruciferous plants caused by Albugo candida. It produces raised, chalky-white pustules—usually on…
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Pest
Turnip moth (Agrotis segetum)
Agrotis segetumAgrotis segetum, commonly called the turnip moth, is an Old World noctuid whose caterpillars act as cutworms. They feed at night on seedlings, foliage,…
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Pest
Black cutworm
Agrotis ipsilon (Hufnagel, 1766)Black cutworm, Agrotis ipsilon, is a nocturnal moth pest whose larvae attack young corn, vegetables, strawberries, turfgrass and many other plants. Small caterpillars chew…
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