ISSUE 1 May 13, 2010
North Central ND
Our first confirmed case of wheat streak mosaic virus (wsmv) came from samples collected in a winter wheat field on April 28 in Ward county. Since then we have seen fields and samples showing moderate to high wsmv symptoms in Renville, McHenry, McLean, and Bottineau counties. Our observations have led us to believe that winter wheat planted prior to Sept 25, 2009 is at the highest risk for infection. We have also found symptoms of this virus in spring wheat volunteers in the area.
Producers are potentially at a higher risk for infections in spring wheat and durum fields this growing season because of over wintering wheat volunteers. The key to successful management is control of volunteers with herbicides or tillage two weeks prior to planting.
For more information please see our website at: http://www.ag.ndsu.edu/NorthCentralREC or call (701) 857-7682.
Crop Protection Specialist
North Central Res. Ext. Center
The geographic area covered by this report includes a northern border of Sheridan County to Eddy County southward to Sargent County and west to Emmons County.
According to NDAWN (North Dakota Ag Weather Network) data, the region received 0.8 to 1.5 inches of rain during May 1 to 11. Low air temperatures of 25 to 29 degrees were recorded on NDAWN during May 7 to 9. The regionís soil temperatures at the 4-inch depth averaged in the low- to mid-40s on May 11. These soil temperatures too low for corn and soybean seed germination or plant development. Farmers are anxious to return to crop planting after these past two weeks of wet and cool soil moisture conditions.
A few 2009 corn fields remain to be harvested. Stands of winter wheat generally are good and the crop is in the jointing stage. Crop planting progress is widely variable, generally ranging from 70 to 85 percent of the regionís acreage complete for small grain and 50 to 65 percent complete for corn. Small grain fields seeded in April are in the 1- to 2-leaf growth stage. Some soybean fields were planted in late April but planting will be a common field operation in the region during the week of May 16. Growth is accelerating with winter annuals and early-emerged, cool-season weeds including quackgrass, dandelion, kochia, wild buckwheat and common lambsquarters.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center