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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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
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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Disease
Bacterial Canker of Stone Fruits
Pseudomonas syringae pv. morsprunorumPseudomonas syringae pv. morsprunorum is a bacterial pathogen associated mainly with bacterial canker, blossom blast, bud death and shoot dieback in cherry and other…
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Disease
Olive Knot Disease
Pseudomonas savastanoi pv. savastanoiOlive knot is a chronic bacterial disease of olive trees caused by Pseudomonas savastanoi pv. savastanoi. It produces rough, tumor-like galls on twigs, branches,…
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Disease
Tomato pith necrosis
Pseudomonas corrugataTomato pith necrosis is a bacterial disease most strongly associated with Pseudomonas corrugata, although similar symptoms can be caused by several other soilborne bacteria.…
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Disease
Prunus necrotic ringspot virus
Prunus necrotic ringspot virusPrunus necrotic ringspot virus is a systemic viral disease of stone fruits and some ornamental hosts, including roses. Symptoms vary widely by virus strain,…
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Disease
Potato virus Y
Potato virus YPotato virus Y (PVY) is a virus disease affecting potatoes and other members of the nightshade family. Symptoms range from mild leaf mosaic and…
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Disease
Potato virus X
Potato virus XPotato virus X (PVX) is a widespread viral disease of potato that may remain completely symptomless while reducing yield and tuber quality. When symptoms…
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Disease
Potato leafroll
Potato leafroll virusPotato leafroll is a viral disease of potato caused by Potato leafroll virus (PLRV). Infected plants may become upright, stunted, pale and stiff, with…
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Disease
Polymyxa betae — Vector of Beet Rhizomania
Polymyxa betae KeskinPolymyxa betae is a microscopic, obligate root parasite and persistent soilborne vector of Beet necrotic yellow vein virus, the cause of beet rhizomania. The…
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Disease
Cucurbit Powdery Mildew
Podosphaera xanthii (Castagne) U. Braun & ShishkoffCucurbit powdery mildew, caused primarily by the obligate biotrophic fungus Podosphaera xanthii, forms conspicuous white, flour-like colonies on cucumber, melon, squash, pumpkin, gourd and…
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