Evaluation of fluroxypyr for weed control in wheat.
Of the herbicides evaluated in wheat cv. HD2285 60 d after sowing (30 d after treatment) over 2 winter seasons on a silty loam site, fluroxypyr at 0.3 kg/ha gave 90% control of Anagallis arvensis, Melilotus alba, M. indica, Vicia sativa and Lathyrus aphaca, while only Chenopodium album was susceptible to 2,4-D at 0.5 kg. Phalaris minor was resistant to this concn of fluroxypyr, and C. album showed only 75% susceptibility. The efficacy of fluroxypyr increased with increasing rate from 0.1 to 0.5 kg, and was enhanced by mixture of 0.1-0.3 kg with 0.25 kg of 2,4-D or 0.5-1.0 kg of isoproturon. None of the herbicide treatments was toxic to the crop. The best weed control (8.7 g DW weeds/m2), broadleaved control efficiency (92.8%) and av. grain yield (5072 kg/ha) was obtained by applying a mixture of fluroxypyr + isoproturon at 0.2 + 1.0 kg (compared to values of 94.3 g/m2, 0.0% and 3289 kg/ha, resp., in unweeded control plots).