Disease
Peach leaf curl
Taphrina deformansPeach leaf curl is a fungal disease of peach and nectarine trees caused by Taphrina deformans. It appears soon after bud break as thickened,…
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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Disease
Potato wart
Synchytrium endobioticumPotato wart is a serious, soilborne quarantine disease caused by the obligate chytrid fungus Synchytrium endobioticum. It produces rough, cauliflower-like galls on potato tubers,…
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Disease
Potato common scab
Streptomyces scabiei (synonym: Streptomyces scabies)Potato common scab is a soilborne bacterial disease associated with Streptomyces scabiei, formerly commonly called Streptomyces scabies. It causes rough, tan-to-brown, corky lesions that…
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Disease
Strawberry mild yellow edge virus
Potexvirus fragariaeStrawberry mild yellow edge virus is an aphid-transmitted virus of strawberries that may cause marginal yellowing, leaf distortion, dwarfing and reduced fruit size in…
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Disease
Stemphylium Leaf Blight
Stemphylium vesicarium (Wallr.) E.G. SimmonsStemphylium vesicarium is a fungal pathogen best known in U.S. production for Stemphylium leaf blight of onion and other Allium crops. Small tan, water-soaked…
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Disease
Corn Head Smut
Sporisorium reilianum (J.G. Kühn) Langdon & Full.; maize-adapted form traditionally cited as S. reilianum f. sp. zeaeCorn head smut is a systemic fungal disease caused by Sporisorium reilianum f. sp. zeae. Infection usually occurs while corn seedlings are emerging, but…
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Disease
Potato powdery scab
Spongospora subterranea f. sp. subterraneaPotato powdery scab is a soil- and seed-borne disease caused by Spongospora subterranea f. sp. subterranea. It produces raised purple-brown pustules that rupture the…
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Disease
Sirococcus shoot blight of conifers
Sirococcus conigenusSirococcus shoot blight is a fungal disease of conifers caused primarily by Sirococcus conigenus. It attacks succulent current-season shoots, especially on pine, spruce, fir,…
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Disease
Septoria leaf spot of tomato
Septoria lycopersici Speg.Septoria leaf spot is a common fungal disease of tomato foliage caused by Septoria lycopersici. It usually begins on the oldest, lowest leaves as…
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Disease
White mold (Sclerotinia stem rot)
Sclerotinia sclerotiorumWhite mold is a widespread fungal disease caused by Sclerotinia sclerotiorum. It attacks many broadleaf crops, vegetables, flowers and weeds, producing water-soaked lesions, soft…
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Disease
Sclerotinia minor: lettuce drop and white mold
Sclerotinia minorSclerotinia minor is a soilborne fungal pathogen best known in the United States for lettuce drop, a destructive crown and basal-rot disease. Infected lettuce…
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Disease
Maple powdery mildew
Sawadaea bicornisMaple powdery mildew caused by Sawadaea bicornis produces conspicuous white to gray, flour-like fungal growth on maple leaves, usually late in the growing season.…
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