Weed Management in Kidney Bean with Tank Mixes of S-Metolachlor, Imazethapyr

Field studies were conducted in various locations in Ontario during 2011 to 2013 to evaluate s-metolachlor, imazethapyr and linuron applied preemergence (PRE) alone and in tankmix combi-nation for the control of troublesome weeds in kidney bean. S-metolachlor, imazethapyr, linuron, s-metolachlor + imazethapyr, s-metolachlor + linuron and s-metolachlor + imazethapyr + linuron applied PRE at rates evaluated caused 3 % or less injury in kidney bean. S-metolachlor provided 87 %-91 % control of redroot pigweed, 46 %- 55 % control of common lambsquarters, and 96 %- 97% control of green foxtail. Imazethapyr provided 93 %- 96 % control of redroot pigweed, 96 %- 99% control of lambsquarters and 86 %- 93 % control of green foxtail. Linuron provided 82 %- 98% control of lambsquarters, 82 %- 99 % control of redroot pigweed and 55 %- 85 % control of green foxtail. The tank mixes of s-metolachlor plus imazethapyr, s-metolachlor plus linuron, and s-me-tolachlor plus imazethapyr plus linuron provided 92 %- 100 % control of lambsquarters, redroot pigweed and green foxtail. Generally, kidney bean yields reflected the level of weed control. Based on these results, tank mixes of s-metolachlor plus imazethapyr, s-metolachlor plus linuron, and s-metolachlor plus imazethapyr plus linuron all provide an adequate margin of crop safety and ex