Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Ceratocystis fimbriata is a wound-infecting fungus associated with several serious diseases, including black rot of sweetpotato, Ceratocystis canker of almond, mango wilt, and wilt…
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The Mediterranean fruit fly, Ceratitis capitata, is a highly polyphagous tephritid pest that attacks ripening fruit and some fruiting vegetables. Females pierce the skin…
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The European wheat stem sawfly, Cephus pygmaeus, is an introduced stem-boring pest of wheat and other grasses in parts of eastern North America. Larvae…
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Stolbur phytoplasma disease is caused by the wall-less, phloem-limited bacterium ‘Candidatus Phytoplasma solani’. It is associated with stolbur in potato, tomato and other crops,…
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Pear decline is a phloem-limited disease caused by ‘Candidatus Phytoplasma pyri’. In the United States, it is mainly spread by pear psylla (Cacopsylla pyricola)…
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European stone fruit yellows is a serious, vector-borne phytoplasma disease of Prunus trees caused by ‘Candidatus Phytoplasma prunorum’. It is especially damaging to apricot,…
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Apple proliferation is a systemic phytoplasma disease caused by ‘Candidatus Phytoplasma mali’, primarily affecting apple trees. It produces witches’ brooms, enlarged stipules, leaf rosettes,…
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Aster yellows is a systemic, leafhopper-transmitted disease caused by ‘Candidatus Phytoplasma asteris’ and related strains. It affects many vegetables, ornamentals, weeds and some woody…
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The horse chestnut leaf miner, Cameraria ohridella, is a small moth whose larvae tunnel between the layers of horse chestnut leaves. The resulting pale…
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Boxwood blight is a destructive fungal disease caused by Calonectria pseudonaviculata. It produces dark leaf spots, rapid browning and leaf drop, and distinctive black…
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Pear sawfly, also called pear slug or cherry slug, is a foliage-feeding sawfly whose slimy larvae skeletonize leaves of pear, cherry, plum and related…
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Pear psylla, Cacopsylla pyri, is a sap-feeding jumping plant louse associated primarily with European pear, Pyrus communis. Nymphs and adults cluster on tender shoots,…
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