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Wheat Midge Flight Ending (07/12/18)

For wheat midge emergence, accumulated degree days have reached more than 1800.

Wheat Midge Flight Ending

For wheat midge emergence, accumulated degree days have reached more than 1800 (see DD map below). As a result, midge emergence will be declining in most areas of the state. Wheat midge emergence is ahead of last year’s emergence due to the hot temperatures, except in the northwest area of ND.

Pheromone trap catches aso have started to decrease at most trapping sites where wheat is in the flowering to milky kernel crop stages (see Wheat Growth Stage map). At trap sites with late-planted wheat in the boot to late heading crop stages (mainly NW and NC areas), higher trap catches were still observed. Wheat is susceptible to wheat midge infestation from heading to early flowering. Updated trap catches are on the PESTWEB system of Montana State University. 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.

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Janet J. Knodel

Extension Entomologist

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