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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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
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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Pest
Japanese beetle
Popillia japonicaThe Japanese beetle, Popillia japonica, is an invasive scarab beetle that damages ornamental plants, fruit crops, vegetables, and turf in many parts of the…
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Pest
Broad mite
Polyphagotarsonemus latus (Banks)Broad mite, Polyphagotarsonemus latus, is a minute tarsonemid mite that attacks tender growing points, young leaves, flower buds and small fruit. Its toxic saliva…
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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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Disease
Rose powdery mildew
Podosphaera pannosaRose 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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Disease
Apple Powdery Mildew
Podosphaera leucotrichaApple 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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Pest
Diamondback Moth
Plutella xylostellaThe diamondback moth, Plutella xylostella, is a small, highly mobile moth whose caterpillars damage cabbage-family crops by scraping, mining and chewing leaves. Young larvae…
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Disease
Plum pox (Sharka)
Plum pox virus (PPV), genus PotyvirusPlum 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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Disease
Blackleg (Phoma stem canker)
Plenodomus biglobosus (synonym: Leptosphaeria biglobosa)Plenodomus biglobosus is a fungus associated with blackleg, or phoma stem canker, of canola, oilseed rape and other Brassicaceae. It commonly produces leaf spots…
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Disease
Grape Downy Mildew
Plasmopara viticolaGrape downy mildew is a destructive disease of grapevines caused by the oomycete Plasmopara viticola. It favors warm, rainy or persistently humid weather and…
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