The first Fusariam Head Blight (FHB) Risk Map of the season is posted on the Manitoba Agriculture website at Fusarium Head Blight Report.
The first map shows the risk for today, June 6, based on precipitation and temperature data the previous seven days. Maps will be updated daily (Monday-Friday) from now until the end of the flowering period for spring wheat in the province (typically late July/early August).
Please refer to the risk maps to help decide risk to your crop, based on heading and flowering stage of your crops. Remember the disease triangle – the existence of a disease requires three factors: the interaction of a susceptible host, a virulent pathogen, and an environment favorable for disease development. Therefore, although a risk map may show High to Extreme risk levels due to environment, disease risk may be low if the wheat crop is not at the proper stage for infection.
Depending on the weather, wheat can move through the following stages of development below in as little as five days to more than a week. So if a fungicide for FHB suppression is planned, scout your fields daily to ensure proper timing.
Submitted by: Pam de Rocquigny, Provincial Cereal Crops Specialist & Pratisara Bajracharya, Field Crop Pathologist, Manitoba Agriculture