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Factors influencing control of annual grasses with sethoxydim or ro 13 8895

Weed Science 32(2): 174-177

Factors influencing control of annual grasses with sethoxydim or ro 13 8895

Studies were conducted to measure the foliar activity of sethoxydim (BAS 9052 OH) { 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl-3-hydroxy-2-cyclohexen-1-one} and RO-13-8895 {acetone-O-[D-2-[p-[(.alpha.,.alpha.,.alpha.-trifluoro-p-tolyl)-oxyl]phenoxy]propionyl]oxime} as affected by adjuvants, soil moisture and growth stage of grasses, and to compare the responses of 3 grass species to these herbicides. The activity of both herbicides was increased by adjuvants. The activity of sethoxydim was not significantly affected by soil moisture. Goosegrass [Eleusine indica (L.) Gaertn] and broadleaf signalgrass [Brachiaria platyphylla (Griseb.) Nash] control was greater with RO-13-8895 at the high than at the low soil moisture level. Soil moisture did not influence large crabgrass [Digitaria sanguinalis] (L.) Scop.] control, since it was relatively tolerant to RO-13-8895. Both herbicides gave greater control at early than at late growth stages. When averaged over all variables, sethoxydim gave greater large crabgrass control than RO-13-8895, but RO-13-8895 gave greater goosegrass and broadleaf signalgrass control than sethoxydim.

Accession: 005441701

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