Predicted Risk for Head Scab Continues to be Low Across Ohio. Although it has rained over the last few days, temperatures have dropped into the upper 50s and lower 60s, with nighttime temperatures in the mid-to-upper 40s in some places. Cold temperatures between anthesis and early grain fill usually reduce the risk for scab, as the disease develops best under warm, wet, or humid conditions. However, do keep your eyes on the weather and the forecasting system as the crop continues to go through the anthesis growth stage over the next few days, particularly in the northern third of the state. The forecast is for warmer temperatures and isolated showers over the Memorial Day weekend and into next week (the week of May 31). Late-developing fields may still be at risk for head scab as temperatures increase, particularly if it stays wet and humid. You may need to consider applying Prosaro, Caramba, or Miravis Ace, but remember, these fungicides are most effective against head scab when th ey are applied at or a few days after anthesis.

--Pierce Anderson Paul, Extension Plant Pathologist, The Ohio State University