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Peak Wheat Midge Flight (07/05/18)

Due to the heat, wheat midge emergence is occurring faster and most of the flight is at peak emergence this week, even in northern ND.

Peak Wheat Midge Flight

Due to the heat, wheat midge emergence is occurring faster and most of the flight is at peak emergence this week, even in northern ND. At 1,600 accumulated degree days (ADD), female wheat midge are 90% emerged. Wheat midge only live <7 days. Observations in North Dakota indicate that by about 1,800 ADD, adult numbers decline to the point where field activity is below economic threshold levels. The North Dakota Crop Progress and Condition News Release indicates that 58% and 42% of the spring wheat and durum wheat is headed, respectively (USDA NASS, News Release, July 2, 2018). So, wheat is still in the susceptible crop stage from heading to early flowering. Field scouting for wheat midge is critical now. See last week’s Crop & Pest Report article.

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PESTWEB system of Montana State University (see trapping map above). Remember, trap catches do not indicate treatment, but do tell growers when wheat midge is present and the relative density of the male wheat midge.

Janet J. Knodel

Extension Entomologist


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