Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Crown gall is a bacterial disease caused by Agrobacterium tumefaciens, also known in current taxonomy as Rhizobium radiobacter. It produces irregular, tumor-like swellings on…
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Dusky wireworm is the soil-dwelling larva of the click beetle Agriotes obscurus. It feeds on seeds, roots, crowns, stems and tubers, with grasses and…
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Agriotes lineatus is a European click beetle whose soil-dwelling larva is called a wireworm. The larvae feed on germinating seeds, roots, crowns, underground stems…
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Agrilus viridis is a metallic green, wood-boring jewel beetle found primarily in Europe and associated with beech, willow, birch, hazelnut and other broadleaf trees.…
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Emerald ash borer (Agrilus planipennis) is an invasive metallic-green beetle whose larvae tunnel beneath the bark of ash trees, disrupting phloem and cambial function.…
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A borsó-levéltetű (Acyrthosiphon pisum) főként borsón, lucernán, bükkönyön, lóbabon és más pillangósokon táplálkozó, szívó szájszervű kártevő. A fiatal hajtásokon és a virágzás–hüvelyképződés időszakában telepei…
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Apple rust mite, Aculus schlechtendali, is a minute eriophyid mite that feeds mainly on apple foliage and developing fruit. Most infestations remain below damaging…
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Bacterial fruit blotch is a serious, seedborne disease of watermelon and other cucurbits caused by Acidovorax citrulli. It is favored by warm, humid conditions…
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The wheat curl mite, Aceria tosichella, is a microscopic eriophyid mite that feeds in the protected folds of wheat and other grasses. Its direct…
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Salt spray injury is a noninfectious environmental disorder caused when windborne seawater or salty deicing-solution droplets deposit on foliage and young shoots. It commonly…
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Salt stress is an environmental disorder caused by excessive soluble salts in the root zone, irrigation water, fertilizer residues, compost, or deicing-salt runoff. It…
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Ice damage is a noninfectious environmental disorder caused mainly by freezing rain that deposits heavy glaze on branches, stems and foliage. The added weight…
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