Rattail fescue and Bromus species control in winter wheat

摘要

Studies were established in imidazolinone-tolerant winter wheat to evaluate wheat response, rattail fescue and Bromus species control and with 1) grass herbicides combined with metribuzin; 2) imazamox plus MCPA ester combinations; and 3) flufenacet/metribuzin and pendimethalin combinations. Studies were arranged in a randomized complete block design with four replications and included an untreated check. All herbicide treatments were applied using a CO_2 pressurized backpack sprayer calibrated to deliver 10 gpa at 32 psi and 3 mph (Table 1). To control broadleaf weeds, studies were oversprayed with thifensulfuron/tribenuron at 0.0156 lb ai/A and bromoxynil/MCPA at 0.5 lb ai/A at the grass herbicide study on May 10; and prosulfuron at 0.0178 lb ai/Aand MCPA amine at 0.35 lb ai/A at the flufenacet/metribuzin and pendimethalin combination study on May 25, 2006. Weed control was evaluated visually. Wheat seed was harvested with a small plot combine in the imazamox combination study on August 18, 2006. Wheat seed was not harvested in the flufenacet/metribuzin and pendimethalin combination study due to non-uniform winter wheat stand and in the grass herbicide study due to poor rattail fescue control.