Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Tomato spotted wilt virus is a serious, thrips-transmitted disease that can stunt or kill young tomato plants and blemish fruit with rings, blotches and…
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Tomato mosaic virus (ToMV) is a highly contagious viral disease of tomato and other documented solanaceous hosts. It produces irregular light- and dark-green leaf…
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Tomato brown rugose fruit virus (ToBRFV) is a highly contagious viral disease of tomato and pepper. It can cause mottled or fern-like foliage, stunting,…
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Tobacco mosaic virus is a highly persistent plant virus that causes irregular light- and dark-green mottling, leaf distortion, stunting and reduced crop quality in…
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Dwarf bunt of wheat is a soil- and seedborne smut disease caused by the fungus Tilletia controversa. It mainly affects fall-sown winter wheat where…
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Common bunt, also called stinking smut, is a seedborne and soilborne fungal disease of wheat caused by Tilletia caries. Infected plants may look only…
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Onion thrips, Thrips tabaci, are tiny, highly mobile insects that rasp and suck plant cells from leaves, especially inside onion leaf folds and near…
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Melon thrips (Thrips palmi) is a very small, warm-weather insect pest that feeds mainly on young leaves, flowers and developing fruit. It is especially…
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Oak processionary moth (Thaumetopoea processionea) is a serious regulated pest of oak trees. Gregarious caterpillars feed on oak foliage, form nose-to-tail processions and build…
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Pine processionary moth, Thaumetopoea pityocampa, is a quarantine pest of concern to U.S. plant health because its gregarious caterpillars feed on pine needles and…
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The two-spotted spider mite, Tetranychus urticae, is a minute arachnid pest of vegetables, fruits, ornamentals and greenhouse crops. It punctures leaf cells and removes…
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The tomato red spider mite, Tetranychus evansi, is a tiny sap-feeding pest most strongly associated with tomato and other solanaceous crops. It causes pale…
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