Itchgrass (Rottboellia cochinchinensis) Control Options in Soybean (Glycine max)

Abstract

In field studies trifluralin and pendimethalin at 1.7 kg ai ha-1applied PPI controlled itchgrass 87 and 78%, respectively, in late season when averaged over a 2-yr period. Clomazone at 1.1 kg ai ha-1applied PRE to the soil surface in one year controlled 80% of itchgrass compared with 51% when applied PPI. POST application of 0.15 kg ai ha-1fluazifop-P, 0.21 kg ai ha-1haloxyfop, 0.10 kg ai ha-1quizalofop, and 1.1 kg ai ha-1diclofop controlled at least 90%. Itchgrass control was less effective with 0.43 kg ai ha-1sethoxydim and 0.07 kg ai ha-1clethodim POST and poor with 0.15 kg ai ha-1imazaquin and 0.07 kg ai ha-1imazethapyr.