Wheat Disease Update 4/27/2022

I have had reports of powdery mildew showing up in a few fields lately. Look for white, powdery spots on leaves in the lower canopy. The undersides of leaves can be covered in the powdery growth of the fungus. Cool, humid, dry conditions favor infection, while prolonged periods of cool, humid weather in spring can allow the disease to reach the flag leaf and cause yield losses. If you see powdery mildew in your wheat prior to heading a triazole, such as propiconazole (Tilt and generics) can do the trick, but the earlier the application the better. Fungicides applied at heading for wheat scab are also very effective against powdery mildew.

White, powdery spots. Photo courtesy of Rick Brown.
Powdery growth covering underside of leaf. Photo courtesy of Rick Brown.

Wheat is heading and flowering across wheat growing regions in VA. The risk of wheat scab remains low due to dry, windy conditions. No fungicide application is warranted for scab management to crops that are currently flowering or will flower in the next several days. To assess risk of wheat scab, go to the web site https://www.wheatscab.psu.edu