Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Colletotrichum acutatum is a fungal pathogen associated with anthracnose, fruit rots, blossom blight, and occasionally crown, stem, or leaf lesions on a wide range…
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Brown soft scale, Coccus hesperidum, is a sap-feeding soft scale insect found on citrus, avocado, holly, houseplants, and many other broadleaf plants in the…
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Tomato bacterial canker is a serious, seedborne bacterial disease caused primarily by Clavibacter michiganensis subsp. michiganensis. It can move systemically through tomato vascular tissue,…
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Cucurbit scab is a fungal disease caused by Cladosporium cucumerinum, most damaging on cucumber, summer squash, pumpkin, winter squash and melons. Cool, wet weather…
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Rhododendron–spruce needle rust is a specialized rust disease caused by the fungus Chrysomyxa rhododendri. It alternates between rhododendron leaves and young spruce needles, producing…
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Cherry leaf roll virus is a graft- and nematode-transmitted viral disease primarily affecting sweet cherry and peach, with apple also documented as a host.…
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Gray leaf spot of corn is a fungal foliar disease caused primarily by Cercospora zeae-maydis. It begins on lower leaves as small spots that…
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Cercospora leaf spot is a fungal disease of beet, Swiss chard and spinach caused by Cercospora beticola. It begins as small, circular gray, tan…
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Canker stain is a lethal vascular disease of sycamores and plane trees caused by the fungus Ceratocystis platani. It commonly begins with thinning foliage,…
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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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