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Wheat Midge Update (07/11/19)

Recent hot temperatures have increased the Accumulated Degree Days (ADD) for emergence of the female wheat midge.

Recent hot temperatures have increased the Accumulated Degree Days (ADD) for emergence of the female wheat midge. For most of the northern tier of ND, we are over 50% emerged (1475 ADD) and approaching 90% emerged (1600 ADD) by the end of the week (see wheat midge NDAWN map on right). Scout if crop is susceptible to wheat midge egg laying (heading to early flowering).

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Pheromone traps are being monitored for wheat midge again this year by the IPM trappers. See PestWeb map of cumulative midge counts 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 male wheat midges. Wheat midge counts are updated weekly on the PESTWEB System of Montana State University during July.

See past Crop & Pest Report articles on wheat midge for more information on scouting:

https://www.ag.ndsu.edu/cpr/entomology/wheat-midge-emergence-update-07-04-19

https://www.ag.ndsu.edu/cpr/entomology/wheat-midge-forecast-for-2019-07-04-19

https://www.ag.ndsu.edu/cpr/entomology/too-early-for-wheat-midge-control-06-27-19

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Janet J. Knodel

Extension Entomologist

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