Castor Ricinus communis L. Tolerance to Postemergence Herbicides and Weed Control EfficacyReportar como inadecuado

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International Journal of AgronomyVolume 2012 2012, Article ID 832749, 5 pages

Research Article

Texas AgriLife Research, Beeville, TX 78102, USA

Texas AgriLife Extension Service, Lubbock, TX 79403, USA

Received 10 January 2012; Accepted 28 February 2012

Academic Editor: M. Tejada

Copyright © 2012 W. James Grichar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Potential US castor production is limited due to only one labeled herbicide trifluralin. Field studies were conducted at two Texas locations during 2008 and 2009 to evaluate postemergence herbicides for castor tolerance and weed control efficacy. Clethodim and fluazifop-P-butyl caused no castor stunting while acifluorfen, bentazon, imazethapyr, and lactofen caused stunting which ranged from 5 to 46%. Imazapic and 2,4-DB caused the greatest stunting 44 to 99% and resulted in castor yields of 0 to 45% of the untreated check. Acifluorfen, imazapic, imazethapyr, lactofen, and 2,4-DB controlled at least 80% smellmelon Cucumis melo L. var. Dudaim Naud. while clethodim and fluazifop-P-butyl controlled at least 98% Texas millet Urochloa texana Buckl. R.Webster. Imazapic and imazethapyr provided 57 to 75% Texas millet control. Results suggest that castor tolerance to the graminicides, clethodim, and fluazifop-P-butyl is high; however, castor injury and yield reductions with the postemergence applications of broadleaf herbicides suggest that these herbicides should not be used in castor production.

Autor: W. James Grichar, Peter A. Dotray, and Calvin L. Trostle



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