Disease Problems to Watch for in August

Here are some diseases we observed in the clinic during the month of August. The hypertext links will lead you to specific information about a certain disease or about diseases in a certain crop.

Field Crops
Corn Southern corn leaf blight
Peanut Tomato spotted wilt, CBR
Soybean Brown spot, Cyst nematodes, Downy mildew, Frogeye leaf spot
Tobacco Black shank,Granville wilt, Hollow stalk, For more information, see the disease chapters in the production guides for flue-cured and burley tobacco

Turfgrasses (TurfFiles Publications)
General Drought, Hydrophobic soils, Soluble salts injury, Mushroom root rot
Bentgrass Pythium root/crown rot
Fescue Brown patch
St. Augustinegrass Gray leaf spot, Insect problems

Woody Ornamentals
General Low pH, Heat/Drought stress, Fertilizer injury, Powdery mildew, Web blight (Rhizoctonia)
Azalea Phomopsis dieback, Phytophthora root rot
Camellia Canker
Cotoneaster Fire blight
Cypress, Leyland Cypress canker, Botryosphaeria canker, Mushroom root rot
Dogwood Anthracnose, Phytophthora root rot, Powdery mildew, Septoria leaf spot, Spot anthracnose, Heat stress
Holly, Japanese Black root rot
Hydrangea Phytophthora root rot, Cercospora leaf spot, Septoria leaf spot, Corynespora leaf spot
Juniper Low pH, Nutritional problem
Maple Anthracnose, Stress symptoms
Oak, Pin Bacterial scorch
Pear, Ornamental Entomosporium leaf spot, Fire blight
Sycamore Bacterial scorch

Herbaceous Ornamentals

General Root-knot nematodes, Rhizoctonia root/stem rot, Heat/Drought stress, Normal late summer decline, Phytophthora & Pythium root rot, Southern blight
Aster Rust
Calendula Aster yellows
Globe Amaranth Alternaria leaf spot, Impatiens necrotic spot virus
Periwinkle, Common Phoma blight
Periwinkle, Madagascar Phytophthora blight
Salvia Botrytis blight, Cercospora leaf spot
Chrysanthemum Bacterial blight/leafspot, Nutritional problem, Pythium root rot, Fusarium crown rot
Geranium Nutritional problem, Pythium root rot
Gloxinia, Ivy, Swedish, Peperomia Impatiens necrotic spot virus

Tree Fruit/Nuts
Apple Cedar-apple rust, Fire blight, Frogeye leaf spot, Bitter rot
Cherry Black knot
Peach Brown rot
Pecan Internal breakdown, Scab

Small Fruit
Blueberry Stem blight, Phytophthora root rot
Grape Anthracnose, Black rot, Downy mildew
Strawberry Phomopsis leaf blight, Anthracnose

Vegetables/Herbs

Bean, Lima Anthracnose, Rhizoctonia root/stem rot
Cucumber Angular leaf spot, Target spot
Ginseng Pythium root rot
Okra Choanephora wet rot
Pumpkin Anthracnose, Downy mildew, Powdery mildew
Squash Downy mildew
Tomato Early blight, Fusarium wilt, Septoria leaf spot, Southern bacterial wilt, Stemphylium gray leaf spot, TSWV
Watermelon Bacterial fruit blotch, Gummy stem blight, Anthracnose

Other Links

Plant Clinic Summaries
Plant Disease Information Notes
Plant Disease and Insect Clinic
Last modified November 2000