Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Pythium ultimum is a soilborne oomycete that commonly causes seed decay, pre-emergence and post-emergence damping-off, and root rot, especially in seedlings grown in saturated…
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Pythium debaryanum is a soilborne oomycete, or water mold, historically associated with damping-off and root diseases in many crops and ornamentals. In the United…
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Pythium aphanidermatum is a warm-weather water mold that causes seed rot, seedling damping-off, root and crown rot, sudden wilt, and—in some crops—foliar blight. It…
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Tan spot, also called yellow leaf spot, is a fungal disease of wheat caused by Pyrenophora tritici-repentis. It produces tan to brown, lens-shaped or…
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Barley net blotch is a fungal leaf disease caused by Pyrenophora teres. The pathogen occurs mainly as the net-form type, which creates brown, net-like…
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Wheat leaf rust is a wind-dispersed fungal disease caused by Puccinia triticina. It produces orange-brown powdery pustules, mainly on wheat leaves, and can reduce…
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Wheat stripe rust, also called yellow rust, is a cool-weather fungal disease caused primarily by Puccinia striiformis f. sp. tritici. It produces yellow to…
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Chrysanthemum white rust is a serious fungal disease of florist’s chrysanthemums, garden mums and a limited group of related daisy plants. Puccinia horiana causes…
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Stem rust is a fungal disease caused by the Puccinia graminis species complex, affecting wheat, barley, oats, rye, triticale and several grasses. Brick-red, elongated…
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Allium rust is a wind-dispersed fungal disease associated mainly with garlic and other Allium crops. It produces conspicuous orange to reddish-brown pustules on leaves,…
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Red fire disease, also called Rotbrenner, is a fungal disease of grapevines caused by Pseudopezicula tracheiphila. It produces vein-limited yellow, red, or reddish-brown leaf…
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Cucurbit downy mildew is a rapidly developing foliar disease caused by the oomycete Pseudoperonospora cubensis. It produces pale yellow to brown, angular leaf spots…
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