PLANT DOCTOR
Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Pest
Citrus mealybug
Planococcus citriCitrus mealybug, Planococcus citri, is a sap-feeding pest of citrus, greenhouse crops, houseplants, ornamentals, fruits and vegetables. Colonies hide in leaf axils, branch crotches,…
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Pest
Six-toothed spruce bark beetle
Pityogenes chalcographus (Linnaeus)The six-toothed spruce bark beetle, Pityogenes chalcographus, is a tiny bark beetle associated mainly with Norway spruce and other conifers. It usually colonizes wind-damaged,…
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Pest
Imported cabbageworm
Pieris rapaeImported cabbageworm is the green caterpillar of the cabbage white butterfly, Pieris rapae, and one of the most common chewing pests of cole crops…
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Pest
Large White Butterfly
Pieris brassicaeThe large white butterfly, Pieris brassicae, is a destructive caterpillar pest of cabbage-family crops rather than a plant disease. Its gregarious, yellow-striped larvae chew…
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Disease
Phytophthora Root and Stem Rot of Soybean
Phytophthora sojaePhytophthora root and stem rot is a serious soybean disease caused by the soilborne oomycete Phytophthora sojae. It can destroy seedlings before emergence or…
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Disease
Phytophthora plurivora Root and Collar Rot
Phytophthora plurivoraPhytophthora plurivora is a water-mold pathogen associated mainly with woody plants in nurseries, landscapes, orchards and forests. It attacks fine roots, larger roots and…
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Disease
Phytophthora palmivora Bud Rot
Phytophthora palmivoraPhytophthora palmivora is a water-mold pathogen that causes bud, spear, crown, root, stem, and fruit rots in warm, humid conditions. It is especially important…
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Disease
Citrus brown rot caused by Phytophthora citrophthora
Phytophthora citrophthoraPhytophthora citrophthora is a soil- and water-associated oomycete best known in the United States for citrus brown rot, but it can also contribute to…
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Disease
Phytophthora cambivora root and crown rot
Phytophthora cambivora (often written Phytophthora × cambivora in modern taxonomic treatments)Phytophthora cambivora is a soil- and water-associated oomycete that attacks roots, crowns and sometimes the lower trunk of woody plants. It is best known…
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Disease
Alder Phytophthora
Phytophthora alniAlder Phytophthora is a serious root and collar disease associated mainly with alder trees (*Alnus* spp.). The water-mold pathogen *Phytophthora alni* can cause fine-root…
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Pest
Allium leafminer
Phytomyza gymnostoma LoewAllium leafminer, Phytomyza gymnostoma, is an invasive fly that attacks onions, leeks, garlic, shallots, scallions and chives. Females puncture leaves for feeding and egg-laying,…
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