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Effect of Adjuvants on Weed Control and Soybean (Glycine max) Tolerance with AC 263,222

Published online by Cambridge University Press:  12 June 2017

Marshall B. Wixson  and
David R. Shaw
Marshall B. Wixson
Affiliation:
Dept. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
David R. Shaw
Affiliation:
Dept. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
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Abstract

Field experiments were established to observe the effects of adjuvants and time of application on weed control and ‘Terra-Vig 515’ soybean tolerance with POST applications of AC 263,222. A nonionic surfactant or a crop oil concentrate increased sicklepod control with AC 263,222 applied at either V2 or V6 soybean growth stages. Sicklepod control increased as AC 263,222 was increased from 35 to 70 g ai ha–1 only when applied without an adjuvant. Late in the season, there was no difference in sicklepod control between V2 and V6 applications. Adjuvants and application timing within herbicide treatments had no effect on pitted morningglory control, and, though adjuvants increased common cocklebur control, all treatments controlled more than 85% of both species. AC 263,222 with adjuvants at all rates and timings injured and stunted soybean more 2 wk after treatment compared to AC 263,222 alone. AC 263,222 at 35 or 70 g ha–1 with crop oil concentrate reduced yields more than AC 263,222, with either a surfactant or no adjuvant when applied to V2 soybeans.

Keywords

AC 263,222, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-methyl-3-pyridinecarboxylic acidcommon cocklebur, Xanthium strumarium L. ♯ XANSTpitted morningglory, Ipomoea lacunosa L. ♯ IPOLAsicklepod, Cassia obtusifolia L. ♯ CASOBsoybean, Glycine max (L.) Merr. ‘Terra-Vig 515’Application timingcrop oil concentratenonionic surfactantCassia obtusifoliaIpomoea lacunosaXanthium strumariumCASOBIPOLAXANST
Type
Research
Information
Weed Technology , Volume 5 , Issue 4 , December 1991 , pp. 817 - 822
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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