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ISSUE 15  August 13, 1998


South-Central ND

    Conditions at CREC are still dry but the dry weather has aided harvesting. Yields around the area are sketchy, but Dakota Growers Pasta plant reported one field of durum wheat with a test weight of 60 to 62 lb/bu, a hard count >90, and 14.4 to 14.6% protein. The plant did not know the yield (bu/a).

Orange Wheat Blossom Midge:

    Grain samples are exhibiting small (1/8 inch), orange larvae. These are the dormant wheat midge larvae. The larvae become dormant in dry conditions and do not shed their last larval skin. Instead, the larvae shrink back inside the skin and stop developing, and can remain this way for up to two months. The larvae will break dormancy once moisture conditions improve and leave the wheat head to spin cocoons in the ground.

European Corn Borer:

    Black light trap counts are increasing slightly and indicate the emergence and flight of the 2nd generation ECB. We were catching about 1 moth per day from July 22 to Aug 10, 2 moths were caught on Aug. 11, and 5 moths caught Aug. 12.

Flea Beetles:

    Flea beetles are congregating on late-planted canola plants, especially those plants located near grassy field margins. Canola nearest the grassy margins are damaged the most from flea beetles feeding on the remaining leaves and developing pods. Some pods are severely scarred and dried, some pods have dried and fallen from the plant, while other pods are slightly marked and healthy. These flea beetle populations this year are more than previous years and indicate the buildup of the beetle population. Overwintering flea beetle populations are expected to be more than last year. Growing untreated canola seed next season may be risky based on this year's beetle population.

Sunflower Midge:

    A random survey across Foster County indicates the sunflower midge moved as far west as Grace City. One field near Grace City had one plant out of nearly 50 with sunflower midge. Midge populations were more near Kensel. In LaMoure County near Dickey, one sunflower field had considerable midge larvae. The sunflower midge emerged from a wheat field (last year's sunflower field) and flew across the road to the sunflower field. The sunflower midge population and infestation decreased as on moved farther into the interior of the field.

Jim Harbour
Area Extension Specialist/Crop Protection
Carrington Research and Extension Center
Carrington, ND

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