Crop & Pest Report


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North Central ND (06/01/17)

Information from the North Central region of North Dakota.

Moderating temperatures have been the theme over the past week across the region. Temperatures will continue to warm into the 70s and 80s over the next seven days with small chances of rain in the forecast. Precipitation over the last week was scattered. The NDAWN station in Minot reported 0.06 inches of rain while the Rugby station reporting 0.017 inches. High wind gusts led to blowing dust over the weekend, allowing fields to dry out. Significant planting progress occurred across much of the region as planting begins to wrap up.

Overall, small grains have begun to tiller while canola has begun to emerge. Early planted canola appears to have reached the rosette stage. Additionally, pulses have emerged in the area. At the NCREC, soybean has germinated and should be emerging soon.

Some cutworms have been found in the area. This should trigger scouting protocols for the next couple weeks. Scouting is performed by following a “W” like pattern, visiting 5 sites in the field. Examine 100 plants at each site, totaling 500 plants, looking for defoliation or cut/wilted plants. Scouting should occur twice per week. Please note, missing plants does not necessarily equate to cutworm damage. Missing plants can also be the result of a defective planter, poor germination, rodents, or birds. Cutworms are often messy and will leave the cut plants within a damaged area. If cutworms appear to be an issue, refer to the 2017 North Dakota Insect Management Guide for control measures and for further information regarding economic thresholds. Some thresholds to note: Small grains – 4-5 per square foot; Canola – 1 larva per 3 feet of row; Soybean – 1 larva per 3 feet of row or when 20% of the plants are cut; Sunflower – 1 larva per square foot or 25-30% stand reduction.

Canola flea beetles have been fairly tame thus far, a result of the cooler temperatures. However, a small hotspot was detected near Ruthville, ND (Ward, CO). Favorable weather conditions will give way as we warm to 70 degrees or warmer with calmer winds. Economic damage is reached when 25% defoliation occurs to the seedlings prior to the 6-leaf stage. Again, consider scouting to determine whether or not control may be warranted. Once beyond the 6-leaf stage, canola plants can tolerate flea beetle damage better.

TJ Prochaska

Area Extension Specialist/Crop Protection

NDSU North Central Research Extension Center

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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