Disease
Pocket Plum
Taphrina pruniPocket plum is a fungal disease of young plum and blackthorn fruit caused by Taphrina pruni. Shortly after flowering, infected fruit enlarge rapidly, become…
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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
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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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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Pest
Egyptian Cotton Leafworm
Spodoptera littoralisThe Egyptian cotton leafworm, Spodoptera littoralis, is a highly polyphagous caterpillar pest of cotton, vegetables, field crops and ornamentals in Africa, the Middle East…
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Pest
Beet Armyworm
Spodoptera exigua (Hübner)Beet armyworm is a highly polyphagous caterpillar pest that feeds on vegetables, field crops, ornamentals and weeds across much of the United States. Young…
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Pest
English Grain Aphid
Sitobion avenae (Fabricius)The English grain aphid, Sitobion avenae, is a phloem-feeding pest of wheat and other small grains. Colonies may develop on leaves, stems, and especially…
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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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