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Wheat Midge Emergence Update (07/04/19)

Emergence of the female wheat midge has just begun at 1300 Accumulated Degree Days (ADD) using a 40⁰F base temperature in North Dakota (see wheat midge NDAWN map below).

Emergence of the female wheat midge has just begun at 1300 Accumulated Degree Days (ADD) using a 40⁰F base temperature in North Dakota (see wheat midge NDAWN map below). At 1475 ADD, female wheat midge are about 50% emerged and at 1600 ADD, about 90% emerged.

Some growers with early planting dates have spring wheat fields that are at heading to early flowering. So, now is a good time to get out and scout for wheat midge at night. Use a flash light and slowly scan the heads of wheat plants for wheat midge adults (small orange fly), counting the number of adults per head, and then calculate an average number of adults per head. The economic thresholds for wheat midge are:  one or more wheat midge observed for every four or five heads on hard red spring wheat, or one or more midge observed for every seven or eight heads on durum wheat.

Consult the NDSU Extension publication E1330 (revised) Integrated Pest Management of the Wheat Midge in ND for more information.

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Janet J. Knodel

Extension Entomologist

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