Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Pseudomonas 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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Olive 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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Tomato 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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Prunus 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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Potato 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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Potato 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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Potato 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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Polymyxa 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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Cucurbit 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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Rose powdery mildew, caused by the obligate biotrophic fungus Podosphaera pannosa, appears as white to gray, flour-like growth on rose leaves, shoots, sepals, buds…
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Apple powdery mildew is a fungal disease caused by Podosphaera leucotricha. It primarily attacks young apple leaves, shoots, flower clusters, buds, and developing fruit,…
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Plum pox, also called Sharka, is a serious viral disease of peaches, plums, apricots, nectarines, cherries, almonds and some ornamental Prunus. Infected trees may…
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