Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
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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Alternaria 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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White 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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Crown gall is a bacterial disease caused by Agrobacterium tumefaciens, also known in current taxonomy as Rhizobium radiobacter. It produces irregular, tumor-like swellings on…
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Bacterial fruit blotch is a serious, seedborne disease of watermelon and other cucurbits caused by Acidovorax citrulli. It is favored by warm, humid conditions…
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Phytophthora cryptogea is a soil- and water-associated oomycete that causes root rot, crown rot, stem lesions, blight, wilting, and plant collapse in susceptible crops…
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Phytophthora nicotianae is a soilborne water mold with a broad but host- and isolate-dependent host range. It commonly causes root, crown, stem, tuber, fruit,…
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Phytophthora ramorum is an invasive, fungus-like water mold that causes sudden oak death in susceptible oaks and tanoak, and ramorum blight or dieback on…
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Red stele is a persistent, soilborne root disease of strawberries caused by the oomycete Phytophthora fragariae. It is favored by cool, saturated soil and…
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Phytophthora cactorum is a soilborne oomycete that causes crown, collar, root, stem, fruit and occasional foliar diseases on a wide range of woody and…
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Phytophthora cinnamomi is a soil- and water-borne oomycete that causes destructive root, crown, collar, and basal stem rots in many woody plants, ornamentals, fruit…
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Phytophthora capsici causes a destructive, water-driven disease of cucurbits, peppers, eggplant, tomatoes, beans and other crops. It can attack roots, crowns, stems, leaves and…
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