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ISSUE 9  July 2, 1998


North-Central ND

    Foliar disease and wheat midge is in the forefront of growers minds for almost all of the herbicide applications have been made. Incidence of disease (Tan Spot, Septoria) has increased this past week. There is only 5 % of the wheat crop that is heading. The majority of the wheat and durum is ten days to two weeks from the heading to early flowering stages.

    Sunflower, dry bean and soybean development is a little behind normal for early July. Sunny, warm weather is needed for these crops to catch up on their development.

Kent McKay
Area Extension Specialist/Cropping Systems


Grain Crops:

   Orange Wheat Blossom Midge Emergence is occurring! The first Orange wheat blossom midge was captured on a white pie plate last Thursday, 6/25, at the North Central Research Extension Center in Minot, Ward County. The field was volunteer wheat. Trap reports from a Surrey grower also indicate wheat midge emergence but low numbers (<10 midge/plate). Other trap reports have been negative for the Kenmare area. Most traps in our region are being set out this week by county agents and grower cooperators. The expected emergence of females was June 27 for most of the north central counties. For counties located farther north (Bottineau, Renville, Burke, Rolette), the female midge emergence is expected closer to July 2.

    Tan spot, septoria, loose smut, and bacterial blight has been found during the wheat disease survey this past week. Tan spot is the most prevalent.


   Diamondback moth Trap counts are decreasing in most areas, and indicate the end of the current flight of moths. As adult moths emerge from pupae, trap counts will increase again.

    Bertha armyworm has arrived in some of the "hot" spots like Bottineau and Renville Counties. The number of moths collected in the traps gives an indication of larval populations later in the season.

   Blister beetles have been reported causing damage to canola in Burke County. These beetles usually only infest a small area of the field, and if control is necessary spot spraying can be used. Finding the infestation early is important and sometimes difficult.


    European corn borer has been captured in Velva, McHenry County. Trap counts were low. No moths were captured in Rugby, Pierce County. This flights represents the first bivoltine flight.

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


South-Central ND

   Soil moisture levels are adequate to excessive in this region of North Dakota. Rainfall during the last 7 days ranged from a low of about 0.25 inch to nearly 10 inches. Portions of Eastern counties including Dickey, Ransom, and Sargent have continued receiving excessive rainfall. Significant hail damage recently occurred on crops in Emmons, McIntosh, and LaMoure counties.

    In general, most crops appear in good condition. Most small grain is in the heading- to flowering-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 is accelerating. Poor drying conditions continue to hamper hay harvest. Some growers are planting warm-season forages including hay millet and sorghum-sudangrass to supplement the disappointing hay yield. Current farm activities include herbicide application in warm-season and late-planted crops, and cultivation of row crops.

Major pest concerns currently in wheat are the orange wheat blossom midge and Fusarium head blight. Midge currently are being found in this region including Barnes, Dickey, Foster, and Stutsman counties. Growers are considering or applying fungicides for scab suppression in early-flowering wheat. Cutworms are still being found in late-planted sunflower. Blister beetles have been found in lupin trials at the Carrington Center and reported in soybean in LaMoure County.

Greg Endres
Area Extension Specialist/Cropping Systems



    Diamondback Moth: Moth numbers are fluctuating between 13 to 51 moth per trap at different locations at the Center.

    Bertha Armyworm: Pheromone traps were placed at different locations (different than the Diamondback moth) on June 25. Last night (June 30-July 1) two moths were caught in one of the traps located in a canola planting date study. Plant development ranged from 6-leaf to 3-inch pod formation.


    European Corn Borer: Black light trap numbers indicate the decline of the bivoltine corn borer moths. However, 51 ECB were collected overnight (June 30-July 1) and indicates the start of the univoltine flights.


    Sunflower Beetles: Larval populations ranged from 2 to 20 per plant on early-planted (May 15) sunflower compared to 0 to 1 larvae/plant on May 28 and June 12 planted sunflowers. Adults are still active and females are still laying eggs on the late-planted sunflowers.


    Orange wheat blossom midge: Pie plate traps were initiated on June 27, one day after CREC reached 1300 DD. Traps located on last year's camelina ground did not have midge on them until the night of June 29-30, and when 7 midge were captured. On June 30-July 1, there were 7 midge on one plate from the camelina ground, but an average of 44 midge per plate (24 and 64, respectively) on last year's durum wheat ground. Further scouting that night indicated 1 to 2 midge per 4 or 5 wheat heads. Thus, CREC has reached the wheat midge economic threshold for flowering wheat. Wheat development at the Center ranges from late boot to mid-flowering. The prediction model was excellent in predicting wheat midge emergence and has aided CREC in management-making decisions.

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

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