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Wheat Midge Flight Update (07/18/19)

Recent hot temperatures continue to increase the Accumulated Degree Days (ADD) for emergence of the female wheat midge.

Recent hot temperatures continue to increase the Accumulated Degree Days (ADD) for emergence of the female wheat midge. For most of the northern tier of ND, we are over 90% emerged (1600 ADD) (see wheat midge NDAWN map below). Scout any spring wheat or durum wheat that is later planted and in the susceptible stages (heading to early flowering). Adult flight will continue until about 1,800 DD, and then populations usually decline to the point where field activity is below the economic threshold levels.

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The updated map for the wheat midge pheromone trap counts is shown below. Remember, trap catches do not indicate the need for a treatment but do tell growers when wheat midge is present and the relative density of the male wheat midge. (Source:  PESTWEB System of Montana State University)

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Janet J. Knodel

Extension Entomologist

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