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ISSUE 10  July 9, 1998


North-Central ND

Grain Crops:

   Orange Wheat Blossom Midge Continuing to Emerge! Orange wheat blossom midge have been captured in Renville, Bottineau, Burke, Ward, and Pierce Counties in the North Central part of the state. Midge numbers have been quite variable. Highest counts have been near Bottineau in Bottineau County and Mohall in Renville County. Peak emergence (1450 GDD) should occur this week in most of the northern counties.

Growing Degree Accumulation as of July 5


Degree Days

Turtle Lake

















    Diamondback moth Trap counts are increasing again in most areas and represents the second generation. The second flight is the most important flight because it is usually present when the crop is susceptible to damage, blooming to early podding.

    Bertha armyworm numbers are still relatively low, but trap catches are more common in the general area.

    Blister beetles have been reported again this week causing damage to canola in a new county Renville. Since the beetle tend to aggregate in one location of a field, spot treatment can be an effective for controlling blister beetles when there is significant damage to flowers or pods.

Janet J. Knodel
Area Extension Specialist Crop Protection
North Central Research and Extension Center
Minot, ND


South-Central ND

    Soil moisture levels are generally adequate in south-central North Dakota. According to NDAWN stations in this region, rainfall during the first week of July ranged from 0.6 to 2.8 inches. Some areas continue to have excessive soil moisture.

    Most crops are in good condition. The majority of small grain is in the flowering to early-seed formation stages. Good yield potential exists with cool-season broadleaf crops including canola, crambe, flax, and field pea. Growth of warm-season crops including corn, dry bean, soybean, and sunflower has accelerated. Bean crops are beginning to flower.


   Diamondback Moth: Moth numbers have decreased from around 50, collected during the July 4th weekend, to 10 moths collected on July 8.

   Bertha Armyworm: One to two moths/day are collected in the pheromone traps located at both a canola planting date study and sulfur fertility trials.


    Orange wheat blossom midge: Pie plate traps have been unsuccessful because of high winds and/or rain during the past evenings. However, last night's (July 7) scouting revealed 1 to 2 midge per 5 to 10 heads. Pie plate traps caught an average of 10 midge/plate at the two CREC locations. At Ypsilanti, pie plate trap counts have been very low with 0 to 4 midge/plate. The wheat midge DD at Carrington is 1603 as of July 7.


   European Corn Borer: Black light trap ECB numbers continue to rise. Approximately 7 ECB were collected during the July 4th weekend, 24 ECB collected on July 7, and 50 collected on July 8. For the pheromone traps, 0 ECB were collected in the E-Race trap and 21 collected in the Z-Race trap on July 8.

Jim Harbour
Area Extension Specialist Crop Protection
Carrington Research Extension Center

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