ISSUE 11 July 23, 2009
During the past two weeks (July 8-21), rainfall at NDAWN sites in the region ranged from 0.4 inch at Dazey and Jamestown, to 2.5 inches at Wishek. Growing degree day (GDD) units for corn continue to be behind this season compared to the long-term average. For example, corn planted May 1 has a range of -130 to -285 GDD units for the period ending July 21, compared to the long-term average.
Winter wheat and barley are nearing maturity, while spring wheat is in various stages of seed development. Early-planted soybean is in the first flower (R1) to initial pod-forming (R3) stages of growth. Also, early-planted dry bean is flowering and sunflower is in the reproductive stage (R1). Scab currently is at very low levels in winter and spring wheat. Low levels of sunscald can be found on the underside of soybean leaves on scattered plants in the region. Soybean aphids are present in the region, currently at low levels. Farmers should be scouting soybean for the aphids until the full seed stage (R6), requiring weekly (or more often) field checks during the next 45 days. Other crop insects to be aware being found in the region include bean leaf and blister beetles in soybean, pea aphids in field peas, and banded sunflower moth in sunflower.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center