ISSUE 3 May 27, 2010
The area covered by this report includes Rolette County east through Pembina County on the north, and Griggs County east through Traill County on the south.
Most of the region made significant planting progress the past week. A few areas in the lake region are still struggling with wet ground. About 90% of the canola in Cavalier County has been planted. Soybean and edible bean planting is underway with many growers in the region near completion. Early seeded soybeans in the valley are starting to emerge. The corn is emerging with decent stands reported. Small grain spraying for broadleaf is underway.
WSMV has been found and confirmed in volunteer grain in Benson County. Tan spot has also been found in winter wheat throughout the region.
Rain started late Saturday, weather systems continued to roll through the region through Monday night. Rainfall totals varied greatly throughout the region with NDAWN stations reporting from ¾ of an inch in Rolette County to 3.25 inches in Grafton, and 3.75 inches at Michigan stations. Three plus inch rainfall amounts were reported in areas of Griggs, Steele, Traill, Nelson, and Walsh Counties.
Area Extension Specialist/Cropping Systems
Grand Forks, ND
North Central ND
Late last week I was in some late April planted canola in Burleigh County. Flea beetles and resulting damage were found on two-leaf seedlings especially on field edges. These fields did have an insecticide treatment, however, the insecticide was no longer effective. Twenty-one days after planting, insecticide treatments for flea beetles begin to lose their efficacy. Twenty-five days after planting, even the high rates of insecticide seed treatments do not effectively control flea beetles on canola (Jan Knodel, NDSU Entomology). Any canola planted in the first week of May or earlier should be scouted to determine if insecticides need to be applied. Insecticides are generally not economical until flea beetles cause 25% defoliation (see example at http://www.ag.ndsu.edu/pubs/plantsci/pests/e1234-9.jpg ). Once the 25% threshold is reached it is important to treat fields within 24 hours because damage can progress rapidly.
A winter wheat sample from Ward County tested positive for barley yellow dwarf virus. This infection probably started last fall when aphid activity was high. This virus is spread by aphids unlike the mite-vectored wheat streak mosaic and high plains viruses. Aphids can acquire the virus after 24-48 hours of feeding and keep the virus for life. Symptoms include yellowing and then red to purple discoloration. Barley yellow dwarf virus infects more than 80 species of annual and perennial grasses including corn and small grains. Yield reduction from this virus is significant on wheat, barley, and oats. The disease can be managed by planting spring cereals early, winter wheat late, and using resistant cultivars. Foliar applications of insecticides can be used to control aphids. Insecticide seed treatments may be useful on winter wheat that emerges during high aphid activity.
Sources: http://elkhorn.unl.edu/epublic/pages/publicationD.jsp?publicationId=923 http://www.ag.ndsu.nodak.edu/aginfo/barleypath/barleydiseases/bdhpdf/barleydwarfvirus.pdf
Crop Protection Specialist
North Central Res. Ext. Center
According to NDAWN (North Dakota Ag Weather Network) data, the region received 2.3 inches (Harvey) to 6.0 inches (Dazey) of rain during May 1 to 24. Soil moisture is adequate to excess. Farmers are anxious to return to crop planting to continue warm-season crop planting.
Alfalfa harvest has started and 2009 corn harvest is essentially completed. Winter wheat continues to generally have good yield potential, based on plant stands and growth. April-seeded small grain fields are in the 3- to 5-leaf growth stage, and herbicide plus fungicide application will continue with cooperative weather. Corn planting is nearly complete and fields planted prior to
May 15 have emerged plants. Other crop planting progress is widely variable, generally 25 to 50 percent complete with soybean planting the most advanced, followed by dry bean and sunflower. Weed growth, especially cool-season annuals and perennials, is accelerating with abundant soil moisture and warm temperatures.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center