Disease
Tan Spot of Wheat
Pyrenophora tritici-repentisTan 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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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Disease
Barley net blotch
Pyrenophora teres Drechs.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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Disease
Wheat leaf rust
Puccinia triticina Eriks.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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Disease
Wheat Stripe Rust
Puccinia striiformis f. sp. tritici Erikss.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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Disease
Chrysanthemum white rust
Puccinia horiana HenningsChrysanthemum 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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Disease
Stem Rust (Black Rust)
Puccinia graminisStem 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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Disease
Allium rust
Puccinia alliiAllium 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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Disease
Red Fire Disease of Grapevine
Pseudopezicula tracheiphila (synonym: Pseudopeziza tracheiphila)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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Disease
Cucurbit Downy Mildew
Pseudoperonospora cubensis (Berk. & M.A. Curtis) RostovzevCucurbit 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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Disease
Pseudomonas viridiflava bacterial blight
Pseudomonas viridiflavaPseudomonas viridiflava is a bacterial plant pathogen with a broad and variable host range. Depending on the crop and strain, it may cause water-soaked…
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Disease
Bacterial Speck of Tomato
Pseudomonas syringae pv. tomatoBacterial speck is a bacterial disease of tomato caused by Pseudomonas syringae pv. tomato. It produces tiny black leaf and fruit lesions, often with…
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Disease
Bacterial blight and canker
Pseudomonas syringae pv. syringaePseudomonas syringae pv. syringae is a bacterial pathogen with a broad and variable host range. In the United States it can cause leaf spots,…
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