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Efficacy of Three Postemergence Grass Herbicides for Soybeans

Published online by Cambridge University Press:  12 June 2017

Robert G. Hartzler  and
Chester L. Foy
Robert G. Hartzler
Affiliation:
Dep. Plant Pathol. and Physiol., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
Chester L. Foy
Affiliation:
Dep. Plant Pathol. and Physiol., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
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Abstract

The effects of herbicide concentration, adjuvants, and temperature on the phytotoxicity of CGA-82725 {2-propynyl 2-[4-[3,5-dichloro-2-pyridinyl)oxy] phenoxy] propionate}, RO 13-8895 {acetone-O-[D-2-[p-(α,α,α-trifluoro-p-tolyl)-oxy] phenoxy] propionyl] oxime}, and BAS 9052 OH {2-[1-(ethoxyimino)-butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexene-1-one} to large crabgrass [Digitaria sanguinalis (L.) Scop. # DIGSA] were evaluated. The addition of adjuvants increased the toxicity of BAS 9052 OH at herbicide rates below 0.14 kg ai/ha, whereas the adjuvants had little effect on the activity of CGA-82725 or RO 13-8895. There were no differences among the adjuvants in enhancing grass control with any of the herbicides. Control of large crabgrass with CGA-82725 or BAS 9052 OH was not affected by temperature at the time of spraying; RO 13-8895 was slightly more toxic at 16 C than at 32 C. Soybean [Glycine max (L.) Merr.] had good tolerance to the three herbicides at rates 3 to 10 times those recommended; no differences in tolerance were observed among seven soybean cultivars. Stage of growth and the addition of an emulsifiable oil adjuvant did not affect soybean tolerance to BAS 9052 OH.

Keywords

Digitaria sanguinalisherbicide toleranceoil adjuvantsBAS 9052 OHCGA-82725RO 13-8895
Type
Research Article
Information
Weed Science , Volume 31 , Issue 4 , July 1983 , pp. 557 - 561
Copyright
Copyright © 1983 Weed Science Society of America 

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