Pest
Stem and Bulb Nematode
Ditylenchus dipsaciStem 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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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Disease
Diplodia seriata (black rot, frogeye leaf spot and canker fungus)
Diplodia seriata De Not. (synonym: Botryosphaeria obtusa)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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Disease
Diplodia tip blight of pine
Diplodia sapinea (synonyms include Sphaeropsis sapinea and Diplodia pinea)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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Disease
Rose black spot
Diplocarpon rosaeRose 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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Disease
Apple blotch (Marssonina blotch)
Diplocarpon mali Harada & Sawamura; commonly treated as a synonym or earlier name of Diplocarpon coronariae (Ellis & J.J. Davis) Wöhner & Rossman. Marssonina coronaria is the former anamorph name.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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Disease
Ascochyta blight of chickpea
Didymella rabieiDidymella 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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Disease
Gummy Stem Blight and Black Rot
Didymella bryoniae (synonym: Stagonosporopsis cucurbitacearum; anamorph: Phoma cucurbitacearum)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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Disease
Raspberry Spur Blight
Didymella applanataRaspberry 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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Disease
Dickeya solani blackleg and soft rot of potato
Dickeya solaniDickeya 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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Pest
San Jose scale
Diaspidiotus perniciosusSan 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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Disease
Phomopsis cane and leaf spot of grape
Diaporthe ampelinaPhomopsis 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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Pest
Asian Citrus Psyllid
Diaphorina citri KuwayamaThe Asian citrus psyllid, Diaphorina citri, is a small sap-feeding insect that attacks tender citrus flush and closely related Rutaceae plants. Its direct feeding…
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