PLANT DOCTOR
Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
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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Disease
Blue Mold of Citrus
Penicillium italicumBlue mold of citrus is a postharvest fruit-rot disease caused by the fungus Penicillium italicum. Infection usually begins in cuts, punctures, abrasions, or split…
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Disease
Blue Mold of Fruit
Penicillium expansumBlue mold is a postharvest fruit-rot disease caused primarily by the fungus Penicillium expansum. It is especially important on apples, pears and other pome…
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Disease
Citrus Green Mold
Penicillium digitatum (Pers.) Sacc.Citrus green mold is a destructive postharvest fruit rot caused by the fungus Penicillium digitatum. Infection usually begins when airborne spores enter cuts, punctures,…
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Disease
Bacterial soft rot
Pectobacterium carotovorumPectobacterium carotovorum causes bacterial soft rot in potatoes and many vegetable, fruit, ornamental and nursery plants. Infected tissue becomes water-soaked, soft and rapidly disintegrates,…
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Disease
Tomato leaf mold
Passalora fulvaTomato leaf mold is a fungal disease caused by Passalora fulva, most often seen on greenhouse and high-tunnel tomatoes when relative humidity remains above…
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Disease
Papaya ringspot virus
Papaya ringspot virusPapaya ringspot virus is a destructive viral disease of papaya and cucurbits. In papaya, it causes yellow mosaic, vein clearing, distorted or shoestring-like leaves,…
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Disease
Dutch Elm Disease
Ophiostoma novo-ulmiDutch elm disease caused by Ophiostoma novo-ulmi is a destructive vascular wilt of elm trees in the United States. Leaves may yellow, wilt, brown,…
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Disease
Walnut Anthracnose
Ophiognomonia leptostylaWalnut anthracnose, also called walnut leaf blotch or walnut black spot, is a fungal disease caused by Ophiognomonia leptostyla and its asexual stage traditionally…
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Disease
European Apple Canker
Neonectria ditissimaEuropean apple canker is a fungal disease caused by Neonectria ditissima, most important on apple and other pome fruits. It enters through pruning cuts,…
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