Fusarium Head Blight and Foliar Diseases Risk in Winter Wheat Continues to Be Low Back »

Figure 1. Fusarium head blight risk prediction as of 6/11/2018. The FHB risk is shown to be low (green color) based on the prediction model which tracts moisture and temperature.

Written collaboratively by Emmanuel Byamukama, Shaukat Ali, Nathan Edwards, and Laura Edwards.

Most of the winter wheat in the state is at flowering or will soon be flowering. A fungicide application is usually done at this wheat growth stage to control Fusarium head blight (FHB) or scab. However, based on the FHB prediction tool, the risk for FHB is low throughout the state (Figure 1) and a fungicide application is not advised. FHB is promoted by wet and warm weather and for the most parts of the state, it has been dry, hence the reason for low risk for this disease. Growers are encouraged to keep checking on FHB prediction tool until wheat is done flowering to determine the need for applying a fungicide to manage FHB.

Foliar leaf diseases severity also remains very low as indicated by the SDSU Small Grains Disease Prediction Tool which is hosted on the Mesonet website. This tool currently shows few infection periods for several locations in South Dakota. The main wheat leaf disease being observed at this time is tan spot at low severity.

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