Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Greenhouse thrips, Heliothrips haemorrhoidalis, is a small dark thrips that feeds mainly on mature leaves, especially in greenhouses and warm U.S. landscapes. Infested foliage…
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Old World bollworm, Helicoverpa armigera, is a highly polyphagous caterpillar pest that attacks flowers, fruits, pods, ears and developing seeds. It resembles the native…
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The brown marmorated stink bug, Halyomorpha halys, is an invasive, highly polyphagous piercing-sucking pest of fruit trees, vegetables, field crops, ornamentals and landscape plants…
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Pear trellis rust is a fungal disease caused by Gymnosporangium sabinae. It produces yellow-to-orange leaf spots, swollen or distorted young fruit, and conspicuous tube-like…
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Cedar-apple rust is a two-host fungal disease caused by Gymnosporangium juniperi-virginianae. It alternates between eastern red cedar or susceptible junipers and apple or crabapple.…
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Black rot of grape, associated with the fungus currently known as Phyllosticta ampelicida and formerly Guignardia bidwellii, is a destructive disease of grapevines in…
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The European mole cricket, Gryllotalpa gryllotalpa, is a burrowing, mostly nocturnal insect that can injure seedlings, vegetable crops, potatoes, ornamental plants and turf by…
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Scleroderris canker is a serious fungal disease of pines and several other conifers, caused by Gremmeniella abietina. In the United States it is most…
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The oriental fruit moth, Grapholita molesta, is a tortricid moth whose larvae attack young shoots first and later tunnel into ripening fruit or, less…
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Grapevine leafroll-associated virus 3 (GLRaV-3) is the principal virus associated with grapevine leafroll disease, a serious disorder of wine, table, raisin, and juice grapes.…
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Grapevine fleck disease is caused by Grapevine fleck virus, a phloem-limited virus that is commonly symptomless in Vitis vinifera cultivars and many grape rootstocks.…
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Grapevine fanleaf virus causes a destructive degeneration disease of grapevines, with distorted fan-shaped leaves, yellow mosaic or vein banding, shortened internodes, poor fruit set,…
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