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Effects of Rainfall and Temperature on Postemergence Control of Sicklepod (Cassia obtusifolia) with Imazaquin and DPX-F6025

Published online by Cambridge University Press:  12 June 2017

Richard M. Edmund Jr.  and
Alan C. York
Richard M. Edmund Jr.
Affiliation:
Crop Sci. Dep., North Carolina State Univ., Raleigh, NC 27695-7620
Alan C. York
Affiliation:
Crop Sci. Dep., North Carolina State Univ., Raleigh, NC 27695-7620
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Abstract

Foliar absorption of imazaquin {ammonium salt of 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acid} following postemergence application was not necessary for control of sicklepod (Cassia obtusifolia L. # CASOB). Application of imazaquin to the soil resulted in control similar to application to the soil plus foliage. A 0.6-cm simulated rainfall 0.05 h after postemergence application of 140, 280, or 560 g ae/ha of imazaquin did not reduce sicklepod control. Foliar absorption was necessary for control with postemergence application of DPX-F6025 {ethyl ester of 2-[[[[(4-chloro-6-methoxypyrimidin-2-yl)amino]-carbonyl] amino] sulfonyl] benzoate}. Application of DPX-F6025 to the foliage resulted in control similar to application to the soil plus foliage. Sicklepod control resulting from postemergence application of 18 g ae/ha of DPX-F6025 was reduced when 0.6 cm of simulated rainfall was received 1 h after application but not when received 4 h after application. With application of 9 g/ha of DPX-F6025, simulated rainfall 24 h after application reduced control. Sicklepod control resulting from postemergence application of sublethal rates of imazaquin and DPX-F6025 was greater when plants were exposed to 3 or more days of 24/18 C day/night temperature than when grown at a continuous 32/24 C temperature. Exposure to low temperature for 3 days immediately before imazaquin application resulted in greater enhancement of control than did exposure for 3 days immediately after application. The reverse was found with DPX-F6025. Control obtained with both imazaquin and DPX-F6025 increased as the number of days of exposure to low temperature increased from 3 to 6. Enhancement of control with low temperature diminished as the herbicide application rate increased.

Keywords

Foliar and root absorptionherbicide washofflow temperaturesimulated rainfallenvironmental effectsCASOB
Type
Weed Control and Herbicide Technolgy
Information
Weed Science , Volume 35 , Issue 2 , March 1987 , pp. 231 - 236
Copyright
Copyright © 1987 by the Weed Science Society of America 

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