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Use of AC 263,222 for Sicklepod (Cassia obtusifolia) Control in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

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

Field experiments were established in 1989 and 1990 to determine the effects of application rate and timing on sicklepod control and soybean tolerance to POST applications of AC 263,222 and chlorimuron. When applied to 3-, 6-, or 10-leaf sicklepod, 35 g ai ha-1 or more AC 263,222 controlled more than 85% of sicklepod early in the season, and season-long when applied to 3- or 6-leaf sicklepod. At all timings, 70 g ha-1 or more AC 263,222 resulted in better control than a PRE application of 420 g ai ha-1 metribuzin followed by 9 g ai ha-1 chlorimuron applied POST. At 35 g ha-1 or more AC 263,222, application timing did not affect sicklepod control. However, control was reduced with 18 g ha-1 when applications were delayed from 3- or 6-leaf to 10-leaf sicklepod. At the 10-leaf sicklepod growth stage, a PRE application of imazaquin increased both sicklepod control and soybean yield with 35 g ha-1 AC 263,222 as compared with AC 263,222 applied alone. Soybean injury and height reductions with AC 263,222 at 35 g ha-1 and above were greater than with chlorimuron; however, increased soybean injury or height reduction was not reflected in pod numbers or yield.

Keywords

AC 263,222, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-methyl-3-pyridinecarboxylic acidchlorimuron, 2-[[[[4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acidimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onesicklepod, Cassia obtusifolia L. ♯ CASOBsoybean, Glycine max (L.) Merr. ‘Terra-Vig 515’ImidazolinoneCASOB
Type
Research
Information
Weed Technology , Volume 5 , Issue 2 , June 1991 , pp. 434 - 438
Copyright
Copyright © 1991 Weed Science Society of America 

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References

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