Soybean (Glycine Max) Tolerance and Sicklepod (Cassia Obtusifolia) Control with AC 263,222

Abstract

In field studies conducted under weed-free conditions, soybean yield was not adversely affected with POST applications of AC 263,222 at 18 g ha−1. At 36 g ha−1, soybean height at maturity was reduced in three of five studies and soybean yield in two of five studies. Application of 9 g ha−1of AC 263,222 to sicklepod at cotyledon to four-leaf (early POST) or at a maximum size of five-leaf (late POST) provided 30 to 48% control. Control was 54 to 73% with AC 263,222 at 9 g ha−1applied early POST followed by late POST. Regardless of application rate or timing, sicklepod control with AC 263,222 generally was inferior to the standard treatments of pendimethalin plus imazaquin PPI followed by imazaquin late POST or pendimethalin PPI and metribuzin PRE followed by chlorimuron late POST. Compared with the weed-free check, soybean yield was reduced when AC 263,222 was applied at 9 g ha−1early POST followed by late POST in one of two studies and in two of three studies when applied at 18 g ha−1early POST.