Plant Pathology, Disease Control of Fruit and Vegetables

Guidelines for Developing an Effective Fungicide Spray Program for Wine Grapes in Maryland

The purpose of this fact sheet is to help wine grape growers in Maryland develop effective fungicide spray programs to manage a complex of five major fungal diseases affecting vines and fruit: powdery mildew, downy mildew, black rot, Botrytis bunch rot, and Phomopsis cane and leaf spot. The spray...
Anne DeMarsay
University of Maryland

Florida Plant Disease Management Guide: Crucifers

Specific Common Diseases Alternaria Leaf Spot (Alternaria brassicicola, Alternaria brassicae, and A. raphani) Anthracnose (Colletotrichum higginsianum ) Bacterial Leaf Spot (Pseudomonas cichorii) Black Rot (Xanthomonas campestris pv. campestris) Black Speck (unknown cause)...
Tim Momol
Richard Raid
Tom Kucharek
University of Florida, IFAS

Florida Plant Disease Management Guide: Celery

Specific Common Diseases: Bacterial Blight and Brown Stem (Pseudomonas cichorii) Cucumber Mosaic (Cucumber mosaic virus) Damping-off (Rhizoctonia spp., Pythium spp., Fusarium spp., and Sclerotinia spp.) Early Blight (Cercospora apii) Late Blight (Septoria apiicola) Pink Rot (...
Richard Raid
Tom Kucharek
University of Florida, IFAS

Florida Plant Disease Management Guide: Carrot (Daucus carota)

Specific Common Diseases: Alternaria Leaf Spot (Alternaria dauci) Bacterial Blight (Xanthomonas campestris pv. carotae) Cavity Spot: (Pythium spp.) Cercospora Leaf Spot (Cercospora carotae) Damping-Off (Rhizoctonia spp., Pythium spp., Sclerotium rolfsii, Fusarium spp., and...
R. N. Raid
University of Florida, IFAS

Damping-off and Root Rot of Beans

Root rots, damping-off before and after seedling emergence, and seed rots are destructive diseases of green, snap, lima, and dry beans. These diseases are caused primarily by soilborne fungi. Significant losses may occur to susceptible varieties, especially if cool, wet weather conditions prevail...
Sally A. Miller
Richard M. Riedel
Randall C. Rowe
The Ohio State University

Cucurbit downy mildew photos

Downy Mildew on Cucumber Downy mildew symptoms on cucumber Downy Mildew Symptoms on Other Crops
Mary K. Hausbeck
Michigan State University

Identifying the Cause of Rot in Black Truffles and Management Control Options

Truffles are the fungal fruiting bodies of ectomycorrhizal fungi belonging to the genus Tuber. In Australia the industry is dominated by one species, the French black truffle (Tuber melanosporum), which is highly prized in the gourmet world for its unique aroma. Current production in Australia has...
Harry Eslick
Rural Industries Research and Development Corporation, RIRDC Australia

Tomato Disorders Gray Wall (Blotchy Ripening)

Affected green fruit have large patches of hard, grayish or yellowish tissue. The affected fruit appears to be poorly ripened or to have ripened at an uneven rate with some patches remaining gray or turning yellow. Inside the fruit, there is uneven coloration of tissue with some areas having a...
Ray Cerkauskas
AVRDC – The World Vegetable Center

Late Blight of Potatoes and Tomatoes

Late blight of potatoes and tomatoes, the disease that was responsible for the Irish potato famine in the mid-nineteenth century, is caused by the fungus-like oomycete pathogen Phytophthora infestans. It can infect and destroy the leaves, stems, fruits, and tubers of potato and tomato plants....
William E. Fry
Cornell University

Cane Blight of Blackberry

Cane blight can be a major disease of blackberry in the Southeast, resulting in severe losses ‐ sometimes causing the complete destruction of fruiting canes in any given year. It is generally not reported in other states as a major disease of blackberries, except when winter injury occurs on...
Phillip M. Brannen
Gerard Krewer
The University of Georgia and Ft. Valley State University