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Effect of Isoxaben Application Rate and Timing on Residual Broadleaf Weed Control in Turf

Published online by Cambridge University Press:  12 June 2017

Rakesh S. Chandran ,
Jeffrey F. Derr  and
S. Wayne Bingham
Rakesh S. Chandran
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0331
Jeffrey F. Derr
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0331
S. Wayne Bingham
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0331
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Abstract

Duration and spectrum of preemergence (PRE) weed control following isoxaben application at 0.56, 0.84, and 1.12 kg ai/ha in spring, fall, or spring plus fall (double) application were evaluated by field experiments. Residual activity of isoxaben was assessed by monitoring weed counts at two locations for 12 mo after treatment (MAT). Buckhorn plantain and dandelion control from spring-applied isoxaben at 1.12 kg/ha was > 90% at 4 MAT in Blacksburg but dropped to < 51% at 12 MAT. Isoxaben at 1.12 kg/ha applied in fall provided ≥ 90% control of buckhorn plantain for 8–9 MAT, with control ranging from 69 to 91% at approximately 12 MAT. Dandelion control with fall-applied isoxaben at 1.12 kg/ha ranged from 60 to 75%, 8–9 MAT. Fall application of 1.12 kg/ ha isoxaben at Virginia Beach controlled henbit and cornspeedwell for 2–3 MAT. Multiple applications of isoxaben improved weed control at Virginia Beach, but results were inconclusive at Blacksburg. In comparison, oxadiazon controlled white sweet clover and dandelion for 1 MAT following spring application in Blacksburg, but < 65% broadleaf control was observed at 4 MAT. Broadleaf weed control following single application of oxadiazon at 3.36 kg/ha was < 60% at 9 MAT Poor weed control resulted from spring applications of isoxaben and oxadiazon when a 25-cm precipitation occurred within 2 wk after application in one study.

Keywords

Isoxaben, N-[3-(1-ethyl-1-methlypropyl)-5-isoxazolyl]-2,6-dimethoxybenzamideoxadiazon, 3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1 -dimethylethyl)-1,3,4-oxadiazol-2-(3H)-onebuckhorn plantain, Plantago lanceolata L. # PLALAdandelion, Taraxacum officinale Weber in Wiggers # TAROFcorn speedwell, Veronica officinalis L. # VEROFhenbit, Lamium amplexicaule L. # LAMAMwhite sweet clover, Melilotus alba Medicus # MEUALPreemergence herbicidesherbicide breakdownEL-107cool season turfgrassDAT, days after treatmentMAT, months after treatmentPRE, preemergence
Type
Research
Information
Weed Technology , Volume 12 , Issue 4 , December 1998 , pp. 569 - 574
Copyright
Copyright © 1998 by the Weed Science Society of America 

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