IPM Pest Information Pages
Powdery Mildew: Kentucky Wheat IPM
|Powdery mildew can easily be diagnosed by the white, powdery patches that form on the upper surfaces of lower leaves and stems. The white patches are often said to resemble cotton. With
age the patches turn a dull gray-brown and may have small black specks embedded. This disease
can spread to all above-ground parts of the plant.
||The fungus responsible for powdery mildew can persist between seasons in infested wheat stubble and in overwintering wheat. Spores then infect plants during periods of high moisture (not
necessarily rain) and cool to moderate temperatures. Low light intensity, which accompanies
dreary weather, and a dense, lush crop canopy favor this disease. Hot daytime temperatures (80 degrees F
plus) and moderate nighttime temperatures will stop powdery mildew development.
|Plant resistant or moderately resistant varieties. Avoid excessively dense, lush stands by using adequate, but not excessive, planting rates and spring-applied nitrogen.
References and Additional Information
- IPM-4 Kentucky IPM Manual for Small Grains
- PPA-10c Kentucky Plan Disease Management Guide for Small Grains by D.E. Hershman and
- Annual Kentucky Small Grain Variety Trials, Progress Report 355
- PPA-36 Fungicides to Control Leaf Diseases in High Yield Wheat
- Foliar Fungicide Use in Wheat, Grain Gleanings, Vol.1, No. 3 (1993)
- Selecting Wheat Varieties, Grain Gleanings, Vol. 1, No. 9 (1993)
- Common Diseases of Small Grain Cereals. F. J. International Maize and Wheat Improvement
Center, Londres 40, Apdo. Postal 6-641, Mexico, D.F., Mexico
- Compendium of Wheat Diseases, M.V. Wiese, The American Phytopathological Society Press,