Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Dothistroma septosporum causes Dothistroma needle blight, also called red band needle blight, on pines and occasionally other conifers. Reddish-brown bands girdle needles, killing the…
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Stem and bulb nematode, also called bloat nematode, is a microscopic plant-parasitic roundworm that attacks garlic, onions, leeks and other crops. Infested plants may…
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Diplodia seriata is a wood-colonizing ascomycete formerly often called Botryosphaeria obtusa. In U.S. orchards it is best known for apple black rot, frogeye leaf…
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Diplodia sapinea causes a damaging shoot blight and canker disease of pine, especially Austrian, Scots, ponderosa, mugo, red, jack and other two- and three-needle…
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Rose black spot is a fungal disease caused by Diplocarpon rosae, affecting cultivated and wild roses throughout humid or frequently wet growing conditions. It…
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Apple blotch, also called Marssonina blotch, is a fungal disease of apple caused by Diplocarpon mali, currently treated taxonomically in many references as Diplocarpon…
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Didymella rabiei is the sexual-stage name associated with Ascochyta blight of chickpea; the asexual stage is commonly called Ascochyta rabiei. This host-specific fungal disease…
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Gummy stem blight and black rot is a fungal disease of cucurbits caused by Didymella bryoniae, with leaf blight, cracked stem lesions that may…
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Raspberry spur blight is a fungal disease caused by Didymella applanata, most damaging to red raspberries and also reported on other Rubus plants. Brown…
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Dickeya solani is an aggressive bacterial pathogen primarily associated with potato blackleg and tuber soft rot. It is most often introduced in infected seed…
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San Jose scale is a small armored scale insect that infests fruit, nut, ornamental and other woody plants in the United States. Crawlers and…
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Phomopsis cane and leaf spot is a fungal disease of grapevines caused primarily by Diaporthe ampelina, historically known as Phomopsis viticola. It produces dark…
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