Disease
Northern corn leaf blight
Exserohilum turcicumNorthern corn leaf blight is a fungal leaf disease caused by Exserohilum turcicum, most important on susceptible field, sweet and popcorn hybrids. It produces…
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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Disease
Azalea leaf and flower gall
Exobasidium vacciniiAzalea leaf and flower gall is a fungal disease associated with Exobasidium vaccinii. On azaleas and rhododendrons it produces swollen, thickened, curled leaves, flowers…
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Disease
Grape Powdery Mildew
Erysiphe necator Schwein. (synonym: Uncinula necator)Grape powdery mildew is a widespread fungal disease of grapevines caused by Erysiphe necator. It produces white to gray powdery colonies on leaves, shoots,…
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Disease
Apiaceae Powdery Mildew
Erysiphe heracleiApiaceae powdery mildew is a fungal disease caused by Erysiphe heraclei and reported mainly on carrots, parsley, parsnips, cilantro, celery, fennel and related plants…
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Disease
Beet powdery mildew
Erysiphe betae (synonym commonly used in U.S. literature: Erysiphe polygoni)Beet powdery mildew is a host-specific fungal disease of sugar beet, table beet, and other Beta plants. It appears first as small, white, powdery…
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Disease
Oak Powdery Mildew
Erysiphe alphitoides (Griffon & Maubl.) U. Braun & S. Takam.Oak powdery mildew is a superficial fungal disease caused by Erysiphe alphitoides, a host-specialized powdery mildew associated primarily with oaks. It produces conspicuous white,…
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Disease
Fire Blight
Erwinia amylovoraFire blight is a destructive bacterial disease of apple, pear and many other members of the rose family, caused by Erwinia amylovora. Blossoms, shoots,…
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Disease
Entomosporium Leaf Spot
Diplocarpon mespili (synonym: Entomosporium mespili)Entomosporium leaf spot is a fungal disease of many woody plants in the rose family, especially red-tip photinia, Indian hawthorn, pear, quince, pyracantha, loquat,…
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Disease
Grape Anthracnose (Bird’s-Eye Rot)
Elsinoë ampelinaGrape anthracnose, also called bird’s-eye rot or grapevine black spot, is a fungal disease caused by Elsinoë ampelina. It attacks young green tissues during…
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Disease
Dothistroma needle blight (red band needle blight)
Dothistroma septosporumDothistroma 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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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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