Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Powdery Mildew Disease in Wheat

Posted by romeethredge on February 5, 2013

We are finding powdery mildew disease in many wheat fields this week. We are thankful for the rain but these wet cloudy conditions make the disease worse. Powdery mildew isn’t as serious a problem as rust in wheat and it’s too early to spray a fungicide but we need to keep tabs on this problem. It is worse in rank growing wheat. Below are several photos I took yesterday.

Here’s a report from our UGA Extension Wheat Plant Pathologist, Dr. Alfredo Martinez – Espinosa.

 “Several Blumeria graminis (Syn Erysiphe graminis or wheat powdery mildew) infections on wheat fields have been reported and confirmed in South and Central Georgia.

Weather has been conducive for the disease. Typically, daytime temperatures for
optimal Powdery mildew infection range between 50-70ºF and a relative humidity
above 85%. Powdery mildew tends to diminish as temperatures consistently reach
above 75ºF and RH falls below 85%. Powdery mildew can continue to be a threat
if weather conditions conducive for disease prevail in your county.

Still too early for fungicide applications for powdery mildew; If powdery mildew is
continuing to progress up the plant and is found in upper leaves (flag leaf
minus 2) you may consider a fungicide application.

Powdery mildew tends to diminish as temperatures consistently reach above 75ºF and RH falls below 85%.

_DSC2964_DSC2957_DSC2949_DSC2948

Wheat variety is very important, might want to check the disease package for
that variety on page 11 of the 12-13 Wheat Production Guide”

http://www.caes.uga.edu/commodities/fieldcrops/gagrains/documents/2012_13WheatProductionGuideComplete.pdf

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