South-Central ND

During June 25 to July 1, rainfall at Streeter totaled over an inch, while other areas received 0 to 0.37 inches as recorded at NDAWN sites. Estimated daily crop water use on July 1 in south-central ND: corn (May 15 emergence) = 0.24-0.32 inches; wheat (May 15 emergence) = 0.34-0.40 inches; soybean (May 29 emergence) = 0.17-0.24 inches; and sunflower (June 5 emergence) = 0.21-0.29 inches. Crop conditions vary, depending on amount of June rainfall. North of Highway 200, crop conditions generally are fair to good. Additional rainfall is needed throughout the region, especially south of Highway 200. Moisture and moderate air temperatures are needed to support seedfill in small grain,

and maintain seed yield potential in flowering canola and flax. In counties south of I94 and west of Highway 281, rainfall will only help salvage warm-season crops.

Herbicide application continues in soybean, dry bean and sunflower. Growers, especially in drouth areas, should continue monitoring for grasshoppers. Late-seeded wheat (prior to heading) and soybean should be scouted for aphids. By the end of the first week in July, female orange wheat blossom midge should have emergeed throughout the region, but risk appears low. On July 1, the sclerotinia risk map for canola indicated Kidder, western Stutsman, Foster and southern Wells counties were at moderate risk for stem rot infection. According to the NDSU small grain disease forecasting model, during June 18-30 for headed wheat at Carrington, conditions favorable for tan spot infection were present 8 of 13 days and favorable conditions for leaf rust occurred 6 of 13 days. Disease forecasting models including Fusarium head blight can be viewed at the following website: http://www.ag.ndsu.nodak.edu/cropdisease/cropdisease.htm

Greg Endres

Area Extension Specialist/Cropping Systems

NDSU Carrington Research Extension Center

Gregory.Endres@ndsu.nodak.edu