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Wheat Midge Degree Days for Scouting (06/23/16)

A degree-day model is a good predictor of wheat midge emergence for timing field scouting.

Wheat Midge Degree Days for Scouting

A degree-day model is a good predictor of wheat midge emergence for timing field scouting. The model is based on spring wheat development. It is available on the NDSU North Dakota Agricultural Weather Network website.

  1. Go to NDAWN.  Http://ndawn.ndsu.nodak.edu
  2. Drop down to “Applications” and click
  3. Click on “Wheat GGD/Midge DD”
  4. Click on “TABLE” tab (at the top)
  5. Select your nearest weather station and enter your “planting date” (on the right)
  6. Click on “Get Table” The table lists accumulated degree days (ADD) for wheat midge according to your planting date and indicates whether your wheat is at risk or in the susceptible stage (heading) when female wheat midge is emerging.

Observations indicate the following accumulated degree days for wheat midge (base temperature 40°F):

ent.10

Most wheat midge infested northern counties are about 1,100 or more ADD which indicates that the male midge is emerging now. Next week, the female wheat midge should be emerging.

Janet J. Knodel

Extension Entomologist

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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