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Controlling Two Sprangletop (Leptochloa spp.) Species with Preemergence Herbicides

Published online by Cambridge University Press:  12 June 2017

Lambert B. McCarty ,
D. Wayne Porter ,
Daniel L. Colvin ,
Donn G. Shilling  and
David W. Hall
Lambert B. McCarty
Affiliation:
Dep. Environ. Hortic, Fifield Hall, Box 110670, Univ. Florida, Gainesville, FL 32611-0670
D. Wayne Porter
Affiliation:
Dep. of Agron, Gainesville, FL
Daniel L. Colvin
Affiliation:
Dep. of Agron., Gainesville, FL
Donn G. Shilling
Affiliation:
Dep. of Agron., Gainesville, FL
David W. Hall
Affiliation:
KBN Engineering and Applied Sciences, Gainesville, FL
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Abstract

Field and greenhouse studies were conducted to evaluate selected PRE-applied herbicides for sprangletop control. In greenhouse studies, oxadiazon and dithiopyr provided excellent (> 89%) red sprangletop (L. filiformis) control. Pendimethalin and metolachlor + atrazine provided good (80–89%) to excellent control for 6 mo and 2 mo during studies 1 and 2, respectively. Isoxaben and atrazine provided poor (< 70%) control during both greenhouse studies. In field studies, good to excellent bearded sprangletop (L. fascicularis) control followed dithiopyr, pendimethalin, metolachlor, and metolachlor + atrazine treatments. Dithiopyr at 0.8 kg ai/ha provided best (> 95%) sprangletop control throughout the 6-mo testing period. Under field conditions, control was inconsistent following oxadiazon with good to excellent control during one study and poor control in another study. Better or equal control than metolachlor + atrazine followed dithiopyr, pendimethalin, and metolachlor alone treatments. Oxadiazon also provided similar or better control than metolachlor+atrazine in three of four studies. Over all studies, dithiopyr provided best sprangletop control, followed by metolachlor, metolachlor + atrazine, pendimethalin, and oxadiazon. Isoxaben and atrazine treatments provided poorest or inconsistent sprangletop control.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminedithiopyr, S,S-dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinecarbothioateisoxaben, N-[3-(1-ethyl-1-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamidemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamideoxadiazon, 3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4-oxadiazol-2-(3H-onependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenaminered sprangletop, Leptochloa filiformis # LEFFIbearded sprangletop, Leptochloa fascicularis # LEFFASod productionturfgrassatrazinedithiopyrisoxabenmetolachloroxadiazonpendimethalinLEFFALEFFI
Type
Research
Information
Weed Technology , Volume 9 , Issue 1 , March 1995 , pp. 29 - 33
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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