Plant Disease Identification and Control

Information on plant disease identification and control, including rot, freeze damage, rust, blight, mold, scales, bacteria, viruses, fungus, wilt, mildew, gall, mites, moths and cankers. Tips on integrated pest management and herbicide summaries.

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Symptoms typical of severe anthracnose infection on blackberry.
Blackberry Fruit Disorders - Effects on Fruit Quality - Articles Articles
This article discusses some common blackberry fruit issues, including whitening of drupelets, drupelet reddening, insect feeding injury, canker diseases and spotted wing drosophila. More
Source: SCRI-Dundee , Scottish Crop Research Institute,
Bramble Diseases - Viruses - Articles Articles
Virus diseases can seriously damage brambles, especially raspberries, and can affect the lifetime of a planting. More
Raspberry Mosaic Virus. Photo by K. Demchak.
Bramble Diseases - Virus Control - Articles Articles
Control measures for virus diseases in brambles are aimed mainly at removing sources of the virus from within and around the planting. More
Strawberry Disease - Verticillium Wilt
Strawberry Disease - Verticillium Wilt - Articles Articles
Verticillium wilt of strawberry, caused by the soilborne fungus Verticillium albo-atrum, infects more than 300 kinds of cultivated plants. More
Bramble Disease - Verticillium Wilt
Bramble Disease - Verticillium Wilt - Articles Articles
Verticillium wilt is caused by two common soilborne fungi (Verticillium dahliae and Verticillium albo-atrum) that have a wide host range and attack more than 300 woody and herbaceous plants. More
Source: Mary Ann Hansen, Virginia Polytechnic Institute and State University,
Bramble Disease - Spur Blight - Articles Articles
Red and purple raspberries are more affected by spur blight, Didymella applanata, than black raspberries. Blackberries appear to be immune. More
Source: SCRI-Dundee , Scottish Crop Research Institute,
Strawberry Disease - Red Stele - Articles Articles
Red stele, or red core, Phytophthora fragariae, is the most serious disease of strawberry in areas with cool, moist soil conditions. More
Blueberry Disease - Powdery Mildew, Not Symptoms You’d Expect
Blueberry Disease - Powdery Mildew, Not Symptoms You’d Expect - Articles Articles
Powdery mildew, a warm-weather high-humidity disease, is present in some blueberry plantings. Lowbush, highbush, and rabbiteye blueberries are all affected. More
Photo by Kathy Demchak.
Strawberry Disease - Powdery Mildew - Articles Articles
Powdery mildew, Sphaerotheca macularis, occurs on a wide range of hosts and almost everywhere the strawberry is grown. More
Source: André Bolay, St. Fédér. de Recherches Agronomiques de Changins,
Raspberry Disease - Phytophthora Root Rot - Articles Articles
Phytophthora root rot, Phytophthora species, is now regarded as a major cause of declining red raspberry plantings. More
Source: Edward Beasley, University of Georgia,
Blueberry Disease - Mummy Berry - Articles Articles
Mummy berry, Monilinia vaccinii-corymbosi, is the most serious and widespread disease of highbush, lowbush, and rabbiteye blueberries. It is most serious following moist, spring weather conditions. More
Photo 1. Early symptom of orange rust. Photo: K. Demchak
Bramble Disease - Managing Orange Rust - Articles Articles

Bramble Disease - Managing Orange Rust

Kathy Demchak, mahfuzur rahman

Orange rust, Gymnoconia nitens, is a systemic disease, any plants propagated from infected plants will also be infected. More
Source: Frank Louws, NCSU.
Strawberry Disease - Leather Rot - Articles Articles
Leather, or crown rot, Phytophthora cactorum, infection is favored by warm, wet weather and poorly drained soil. The fungus attacks berries in the field at all stages of growth. More
Source: Edward Sikora, Auburn University,
Strawberry Disease - Leaf Spots - Articles Articles
A wide array of leaf spots infect strawberries, including birds-eye leaf spot, black leaf spot, septoria leaf spot, cercospora leaf spot, alternaria leaf spot, red spot, and angular leaf spot. More
Source: B. Martin. USDA-ARS Horticulture Crops Research Unit
Bramble Disease - Leaf Curl Virus - Articles Articles
Raspberries are affected more severely by leaf curl than are blackberries. More
Photo by Kathy Demchak.
Strawberry Disease - Gray Mold - Articles Articles
Gray mold, or botrytis blight, Botrytis cinerea, causes a greater loss of strawberry flowers and fruit than any other disease. It is found on green as well as ripening and harvested fruit. More
Source: K. Demchak.
Bramble Disease - Crumbly Berry - Articles Articles
Crumbly berry, also called raspberry bushy dwarf, is the most common bramble virus in the Mid-Atlantic region. It is caused by the tomato ringspot virus. More
Eric Coombs, Oregon Department of Agriculture,
Raspberry Diseases - Crown Gall and Cane Gall - Articles Articles
Crown gall, Agrobacterium tumifaciens, and cane gall, Agrobacterium rubi, are bacterial diseases that seriously limit raspberry production in Pennsylvania. More
stem canker (Leptosphaeria coniothyrium). Photo: Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services,
Bramble Disease - Cane Blight - Articles Articles
Cane blight is caused by the fungus Leptosphaeria coniothyrium, which also causes a canker on roses and a fruit rot of apple and pear. More
Botrytis infection at site of feeding damage. Photo by Kathy Demchak.
Bramble Disease - Botrytis - Articles Articles
Botrytis fruit rot or gray mold, Botrytis cinerea, is the most common and most serious disease of Rubus species worldwide. More
Photo by Kathy Demchak.
Grape Disease - Black Rot - Articles Articles

Grape Disease - Black Rot

Kathy Demchak

Black rot, Guignardia bidwelli, is one of the most serious diseases of grapes in the eastern United States. More
Photo by Kathy Demchak.
Strawberry Disease - Black Root Rot - Articles Articles
Black root rot is known as a "disease complex," meaning that it can be caused by several factors. More
liz west, Flickr
Bramble Disease - Black Raspberry Streak - Articles Articles
Black raspberry streak is caused by a virus. During warm periods, inconspicuous purple streaks less than 1 inch long form on the lower part of infected canes. More
Photo by Kathy Demchak.
Strawberry Disease - Anthracnose - Articles Articles
Anthracnose, caused by species in the genus Colletotrichum, can manifest as a fruit rot, crown rot, and/or leaf spots, as well as lesions on petioles and runner stolons. More
Photo by Kathy Demchak.
Raspberry Disease - Anthracnose - Articles Articles
Anthracnose, commonly called "cane spot" or "gray bark," occurs in several species of Rubus. More
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