NDSU Crop and Pest Report


ISSUE 2   May 13, 2004

North-Central ND

Grasshoppers – First instar grasshopper nymphs (or young grasshoppers) were found in grassy ditches near NCREC at Minot. This is an earlier than normal emergence for our cropland grasshoppers, which usually come out mid to late May. Any large adult grasshoppers (with wings) or late instar nymphs (>1_inch long) are not pests that attack our croplands. These prefer to feed on native grasses and other vegetation. The cropland grasshoppers, like twostriped grasshopper overwinter as eggs and will be emerging as small first instar nymphs about the size of a wheat kernel. Although a few young cropland grasshoppers have already started to emerge, these grasshoppers are very susceptible to cold, wet weather conditions. So, the wet, cold, snowy conditions should kill many of these early emerging, young grasshoppers. Hatching will continue in several bursts following warmer weather and extend for a long period of time, sometimes as long as 75 days for twostriped grasshopper.

Diamondback moth – The first Diamondback moths were captured in pheromone traps at NCREC, Minot. Trap counts numbers are very low indicating the first arrival of these migrating moths from the southern states.

Crucifer flea beetles – No crucifer flea beetles have been detected on yellow sticky traps at NCREC, Minot. Moisture and warmer weather will trigger their spring emergence soon.

Cutworms – Early season activity of young cutworms like Dingy cutworm have been observed feeding on volunteer sunflowers.

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


South-Central ND

During the past week (May 5 to 11), the south-central region’s rainfall ranged from 0.14 inches at Linton to 1.66 inches at Jamestown as recorded at NDAWN (North Dakota Agricultural Weather Network) sites. Topsoil moisture generally is adequate but the subsoil has additional water-holding capacity. The region’s average soil temperature at the 4_inch depth ranged from 45 to 58 F on May 11.

The region’s cool-season crop planting including wheat, barley, field pea, canola, and flax is essentially complete. Corn planting also is nearly completed. Soybean planting is in progress, with about 50 to 75% of the acreage planted in counties south of Interstate 94 and 10 to 25 % complete north of I94. Dry bean and sunflower planting also will soon start.

Alfalfa, winter wheat and early-seeded wheat and barley have had leaf damage from frost. Additional leaf injury to crops is expected during this week of May 9. Fortunately, soybean have not emerged. Farmers should visit NDAWN at http://ndawn.ndsu.nodak.edu/applications.html  to use growing degree day information to determine leaf stages of frost-injured wheat and corn for proper timing of POST pesticide application. Wild oat spraying in wheat has started in southeast counties. In addition to cool-season weeds, pigweed and foxtail species are emerging.

Greg Endres
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center


Northeast ND

Precipitation amounts of at least one inch has provided a welcome blanket of seedbed moisture throughout NE ND. Rapid progress has been made in seeding of cool season crops and corn. About 80 percent of the small grain has been seeded along with 70 percent of the canola. Corn planting is largely completed south of highway 17 with some acres left in northern regions. Some sunflower and soybean acres have been planted but growers were just getting started prior to the rain and snow. April plantings of wheat ,barley and canola are starting to emerge along with wild oat. Freezing temperatures predicted for Wednesday and Thursday is causing concern for the small acreage of emerged canola and flax.

Terry Gregoire
Area Extension Specialist
Devils Lake Office

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