ICI Americas Inc. is developing FUSILADE(TM) Herbicide, (±)-butyl 2-[4-[[5-(trifluoromethyl)-2-pyridinylloxyl phenoxylpropanoate, for postemergence grass control in broadleaf crops. The common name is fluazifop-butyl.

Daniel and Majure (2) reported results of work with FUSILADE for control of Bermudagrass, Cynodon dactylon (L.) Pers., in cotton, Gossypium hirsutum L., in Arkansas and Louisiana during 1481. FUSILADE provided excellent control of bermudagrass when stolons were less than twelve inches long. Higher rates were needed to control larger, established bermudagrass. The inclusion of a crop oil concentrate increased the speed of control, but had no apparent effects on the final degree of control when Compared to an 80/20 nonionic surfactant.

Chandler (1) found large variations in the response of different bermudagrass biotypes in Mississippi to FUSILADE. No attempt was made to define biotype differences between the various trial sites used in this work. Biotype response could account for some of the differences observed between trial sites, however, we do feel trends reported occurred with enough trial re plications to offset any biotype effects.

The objectives of this work with FUSILADE for control of bermudagrass in cotton were to evaluate 1) efficacious rates in various midsouth locations, 2) en vironmental effects, 3) sequentially applied versus singularly applied treatments, 4) influence of growth stage, 5) effects of adjuvants and their varying rates, 6) effects of tank mixes with early-season insecticides, and 7) efficacy of aerial applications.