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Effects of Rain-Free Intervals and Herbicide Rate on Sicklepod (Cassia Obtusifolia) Control and Absorption with AC 263,222

Published online by Cambridge University Press:  12 June 2017

Larry J. Newsom  and
David R. Shaw
Larry J. Newsom
Affiliation:
Dep. Plant Pathol. Weed Sci., Mississippi State Univ., Mississippi State, MS 39762
David R. Shaw
Affiliation:
Dep. Plant Pathol. Weed Sci., Mississippi State Univ., Mississippi State, MS 39762
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Abstract

Experiments were conducted to evaluate the effect of a 2.5-cm simulated rainfall 0.05, 0.25, 0.5,1, 3, 6, and 24 h after POST applications of AC 263,222 to sicklepod. Fresh weight reductions were directly related to increasing AC 263,222 rates and rain-free intervals. Fresh weight reductions with 9, 18, 36, 54, and 72 g ai/ha AC 263,222 were 32, 47, 55, 59, and 67%, respectively, with the rain-free treatment. A simulated rainfall 0.05 h after POST application lowered fresh weight reductions with 9, 18, 36, 54, and 72 g/ha AC 263,222 to 5, 7, 19, 23, and 28%, respectively, of the untreated control. As AC 263,222 rates increased, a simulated rainfall shortly after POST application was less detrimental. At 18 g/ha of AC 263,222, a 3-h rain-free interval was necessary for fresh weight reductions equivalent to the rain-free control. As the rate of AC 263,222 increased to 54 g/ha, the rain-free interval for fresh weight reductions equivalent to the rain-free control was reduced to 1 h. Radiolabeled studies indicated that at 3 h after application an equivalent amount of 14C was accumulated in the plant as compared with the rain-free control. The correlation coefficients for fresh weight reductions and 14C in the plant were r = 0.53, 0.75, 0.68, 0.74, and 0.70 at rates of 9, 18, 36, 54, and 72 g/ha AC 263,222, respectively.

Keywords

AC 263,222, (±)-2-[4,5-dihydro-4-methyl-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-methyl-3-pyridinecarboxylic acidsicklepod, Cassia obtusifolia L. # CASOBHerbicide washoffsimulated rainfall
Type
Research
Information
Weed Technology , Volume 8 , Issue 3 , September 1994 , pp. 621 - 624
Copyright
Copyright © 1994 by the Weed Science Society of America 

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