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Efficacy of Bentazon and MSMA as Affected by a Humic Acid-Type Polymeric Polyhydroxy Acid Adjuvant

Published online by Cambridge University Press:  12 June 2017

Chester G. McWhorter ,
Gene D. Wills  and
Robert D. Wauchope
Chester G. McWhorter
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., and the Delta Branch, Mississippi Agric. and For. Exp. Stn., Stoneville, MS 38776
Gene D. Wills
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., and the Delta Branch, Mississippi Agric. and For. Exp. Stn., Stoneville, MS 38776
Robert D. Wauchope
Affiliation:
Southeast Watershed Res. Lab., Tifton, GA 31793
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Abstract

Foliar applications of 14C-bentazon [3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] with PPA (polymeric polyhydroxy acid) at 1 or 2% (v/v) or nonoxynol (9.5 POE) [α-(p-nonylpheny1)-ω-hydroxypoly(oxyethylene)] at 1% (v/v) or mixtures of PPA and nonoxynol did not increase absorption or translocation of 14C-bentazon in soybeans [Glycine max (L.) Merr. ‘Lee 74′] or common cocklebur (Xanthium strumarium L. # XANST). PPA alone at 1 to 2% (v/v) did not significantly affect absorption or translocation of 14C-bentazon in smooth pigweed (Amaranthus hybridus L. # AMACH), but PPA with nonoxynol significantly increased translocation out of the treated leaf. Both PPA and nonoxynol decreased absorption and movement of 14C-MSMA [monosodium salt of methylarsonic acid] out of the treated leaf of johnsongrass [Sorghum halepense (L.) Pers. # SORHA]. In greenhouse research, PPA at 0.25 and 0.5% (v/v) did not increase the level of control of common cocklebur obtained following postemergence applications of bentazon at 0.24 and 0.48 kg ai/ha. Similarly, PPA at 0.25 and 0.50% (v/v) did not increase the toxicity of MSMA at 0.3 and 0.6 kg ai/ha to either johnsongrass or common cocklebur.

Keywords

Soybeansweed controlabsorptiontranslocationPPAhumic acidAMACHSORHAXANST
Type
Weed Control and Herbicide Technolgy
Information
Weed Science , Volume 35 , Issue 2 , March 1987 , pp. 237 - 242
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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