ISSUE 8 July 2, 2009
During the past week (June 24-30), rainfall ranged from one inch at Carrington and Robinson to 0.1 inch at Dazey and Marion, according to NDAWN weather stations. Growing degree day (GDD) units for corn planted May 1 through June 30 range from 585 to 735 units. Our GDD units are ahead of last year and 2004, but about 50 to 100 units behind for the period compared to the long-term average. Early-planted corn is ‘knee high’ (5- to 6-leaf) or taller. Winter wheat is in the early seed-fill stage. Leafspot disease is becoming more prevalent in winter wheat and scab is appearing in the crop. Barley is headed and most spring wheat ranges from flag leaf to early-heading stages.
Farmers are contemplating fungicide choices for early-flower application on spring wheat for scab suppression and control of leafspot diseases. Barley thrips are in the region – late planted barley should be carefully checked for the insect and treated if the economic threshold is reached and the crop is not headed. Small grain aphids are present but at non-economic levels. Early-planted soybean and canola are flowering. Dry bean and sunflower growth rate has recently accelerated and the crops generally are in good condition.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center