Pest
Mediterranean corn stalk borer
Sesamia nonagrioides LefèbvreThe Mediterranean corn stalk borer, Sesamia nonagrioides, is a noctuid moth whose larvae tunnel inside maize stems and can also develop on selected sorghum…
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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
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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Pest
Shothole Borer
Scolytus rugulosusThe shothole borer, also called the fruit-tree bark beetle, is a tiny bark beetle that tunnels beneath the bark of weakened or dying fruit…
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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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Pest
Chilli thrips
Scirtothrips dorsalis HoodChilli thrips (Scirtothrips dorsalis) is a tiny, invasive, highly polyphagous pest that attacks young leaves, shoots, flowers and developing fruit. Feeding causes bronzing, darkening,…
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Pest
American Grapevine Leafhopper
Scaphoideus titanusThe American grapevine leafhopper, Scaphoideus titanus, is a specialized sap-feeding insect associated mainly with grapevines (Vitis). In the United States it is native and…
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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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Pest
Black scale
Saissetia oleaeBlack scale, Saissetia oleae, is a soft scale insect that weakens plants by sucking phloem sap and coating foliage with sticky honeydew. Dark, dome-shaped…
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Disease
White Root Rot (Rosellinia Root Rot)
Rosellinia necatrix Berl. ex Prill. (synonym: Dematophora necatrix)White root rot is a serious soil-borne fungal disease caused primarily by Rosellinia necatrix. It attacks roots and root crowns of many woody plants,…
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Disease
Maple Tar Spot (Giant Tar Spot)
Rhytisma acerinumMaple tar spot is a conspicuous fungal leaf disease caused by Rhytisma acerinum, most characteristically affecting Norway maple and some other European maples. Pale…
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Disease
Barley scald
Rhynchosporium communeBarley scald is a cool-weather fungal leaf disease caused by Rhynchosporium commune, formerly often identified as R. secalis. It produces water-soaked gray-green lesions that…
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