Pest
Turnip flea beetle
Phyllotreta nemorum (Linnaeus, 1758)The turnip flea beetle, Phyllotreta nemorum, is a small, jumping leaf beetle that feeds mainly on Brassicaceae. Adults make numerous pinholes and shot-hole lesions…
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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Pest
Turnip Flea Beetle
Phyllotreta atra (Fabricius, 1775)The turnip flea beetle, Phyllotreta atra, is a small, shiny black flea beetle that feeds mainly on cruciferous plants. Adults chew numerous pinprick “shot…
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Disease
Purple-Bordered Leaf Spot of Maple
Phyllosticta minimaPurple-bordered leaf spot is a common, usually cosmetic fungal disease of maple leaves caused by Phyllosticta minima. It produces circular tan to brown lesions…
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Disease
Citrus black spot
Phyllosticta citricarpaCitrus black spot is a regulated fungal disease caused by Phyllosticta citricarpa. It produces dark, sunken blemishes on ripening citrus fruit, sometimes leaf and…
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Pest
Spotted Tentiform Leafminer
Phyllonorycter blancardellaThe spotted tentiform leafminer, Phyllonorycter blancardella, is a small moth whose larvae tunnel inside apple leaves and create raised, oval, spotted mines. Light infestations…
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Pest
Rose bud mite
Phyllocoptes fructiphilus KeiferThe rose bud mite, Phyllocoptes fructiphilus, is a microscopic eriophyid mite associated mainly with roses in the United States. Its greatest importance is as…
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Disease
Ash Powdery Mildew
Phyllactinia fraxini (DC.) FussAsh powdery mildew is a fungal disease of ash trees caused by Phyllactinia fraxini. It produces conspicuous white, powdery growth mainly on the undersides…
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Pest
Cotton mealybug
Phenacoccus solenopsis TinsleyCotton mealybug, Phenacoccus solenopsis, is a phloem-feeding scale insect native to North America and now established in many warm regions, including parts of the…
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Disease
Onion downy mildew
Peronospora destructorOnion downy mildew is a fast-spreading oomycete disease of onions and other Allium crops caused by Peronospora destructor. It favors cool temperatures, prolonged leaf…
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Disease
Pepino mosaic virus
Pepino mosaic virus (PepMV)Pepino mosaic virus is a contagious viral disease primarily affecting greenhouse and field-grown tomatoes. Symptoms can range from barely visible mosaic and leaf blistering…
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