Carrington Research Extension Center
North Dakota State University
NDSU Extension Service
North Dakota Agricultural Experiment Station

Ag Alert

Seeding wheat past mid-May will likely reduce seed yield. A rule-of-thumb is a yield loss of 1.5 percent per day is possible with seeding dates after May 15. When seeding wheat after May 15, consider increasing seeding rates 0.5 to 1 percent per day using 1.25 million pure live seeds (PLS) per acre as the initial rate. A rate of 1.5 to 1.6 million PLS per acre (or about 34 to 37 plants per square foot) is the suggested maximum rate to use. The increased seeding rates should minimize the number of tillers, which have low yield potential with late seeding, and optimize seed production and quality from the main stem head. It is recommended not to seed wheat past early June. After June 5 to 10, it may be best to consider a warm-season grass such as proso millet or a forage crop such as hay millet, pearl millet, or sorghum/sudangrass.

Tan spot is being found in area winter wheat fields. The leaf disease may soon be found in seedling spring wheat if conditions are correct. Fungicides may be used at the four- to five-leaf for leaf protection from tan spot. Fungicides may be considered if yield potential is high (at least 40 bushels per acre), the wheat variety is susceptible to leaf spot, wheat is grown in wheat residue, leaf spot disease currently is present, and future weather conditions appear to continue favoring disease.

When environmental conditions allow field work to resume, a priority besides the resumption of crop planting will be wild oat control in emerged hard red spring and durum wheat. Post-emergence herbicide choices for wild oat control in wheat include Achieve, Assert, Avenge, Cheyenne (HRS or winter wheat only), Hoelon, Puma, and Tiller (HRS or winter wheat only). Refer to herbicide labels and NDSU Extension Service circular W-253 "1999 North Dakota Weed Control Guide" for required information on use.

Greg Endres, Area Extension Specialist/Cropping Systems, Email:
1999 Ag Alert Archive * Carrington R&E Center Home Page * NDSU Agriculture