ISSUE 13 August 7, 2008
During the past week (July 30 through Aug 5), the region received rain ranging from 0.25 inches at Marion and Robinson to 2.2 inches at Oakes, based on NDAWN (North Dakota Agricultural Weather Network). Adequate soil moisture is needed to support yield potential of our row crops that currently are in critical reproductive stages.
Winter wheat, barley and field pea harvest is underway, with spring wheat soon to follow. Most of the regionís corn is in the tassel to silking stages. The same story continues to exist Ö the crop continues to lag in development compared to previous years. Corn planted on May 1 at Carrington was at about 1200 growing degree day (gdd) units, Linton at 1340 gdd units, and Oakes at 1450 gdd units as of August 5, with these sites at minus 90 to 140 gdd units compared to the 5-year average. Soybean are in the pod-formation stages (R3-R4) of development, dry bean in the full-flower to early-pod formation stages, and sunflower in the late pre-flower to early-flower stages (R4-R5).
Soybean aphid populations are increasing - it is important to continue scouting during the next month but delay insecticide treatment until proper insect densities are reached. Other insects to be monitored include grasshoppers, leafhoppers in dry bean and bean leaf beetles in soybean. Continue scouting for sunflower rust, as well as head insects, during the next 1-2 weeks. Bacterial brown spot has been found in dry bean in the Oakes area.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center