Weed control and grain sorghum tolerance to flumioxazin

Field studies were conducted from 2002 to 2004 to determine weed control and sorghum tolerance to flumioxazin. Flumioxazin at 0.07 and 0.11 kg ai/ha was applied 30, 21, 14, 7, and 0 days prior to sorghum planting. Flumioxazin at either dose provided excellent control of Amaranthus tuberculatus and Parthenium hysterophorus but provided variable control of Panicum texanum. No sorghum injury was noted with flumioxazin at any application timing. Reduction in sorghum yields were noted where annual grasses and broadleaved weeds were not effectively controlled.