Identifier

etd-11162014-191107

Degree

Master of Science (MS)

Department

Plant, Enviromental and Soil Sciences

Document Type

Thesis

Abstract

Propanil has long been a staple of weed management in rice production. The introduction of IR rice allowed for the use of imidazolinone herbicides in crop for the control of red rice. Six studies were conducted in 2011 and 2012 to evaluate the weed control interactions, synergistic, antagonistic, or additive, of imazethapyr or imazamox when mixed in a single application with propanil, thiobencarb, or a pre-packaged mixture of propanil plus thiobencarb. Blouin’s modified Colby’s was used to determine if a synergistic, antagonistic, or additive response occurred. Two studies were established to evaluate imazethapyr at 0 and 70 g ha-1, or imazamox at 0 and 44 g ha-1, when mixed with propanil at 1680 or 3360 g ha-1, thiobencarb at 1680 or 3360 g ha-1, a pre-packaged mix of propanil plus thiobencarb at 840 or 1680 g ha-1, and no mixture herbicide. A synergistic response occurred for red rice control at 7, 14, 21, and 49 DAT when imazethapyr was mixed with propanil plus thiobencarb at 840 and 1680 g ha-1; and at 7, 14, 21, and 49 DAT when imazamox was mixed with propanil plus thiobencarb at 1680 g ha-1. Two other studies were established to evaluate imazethapyr at 0 and 70 g ha-1, or imazamox at 0 and 44 g ha-1, was mixed with propanil at 0, 1.12, 2.24, 3.36, or 4.48 kg ha-1.A synergistic response occurred for red rice control at 7 and 14 DAT when imazethapyr was mixed with propanil at 2.24, 3.36, and 4.48 kg ha-1; and at 7, 14, 21, 28, 35, and 49 DAT when imazamox was mixed with propanil at 3.31 and 4.48 kg ha-1. The addition of propanil, thiobencarb, or a pre-packaged mixture of propanil plus thiobencarb in a mixture with imazethapyr or imazamox can increase the overall weed spectrum from the herbicides applied alone. The addition of multiple herbicide modes of action in a single application can help prevent or slow the development of herbicide resistant weeds as well as red rice outcrossing with IR rice.

Date

2014

Document Availability at the Time of Submission

Secure the entire work for patent and/or proprietary purposes for a period of one year. Student has submitted appropriate documentation which states: During this period the copyright owner also agrees not to exercise her/his ownership rights, including public use in works, without prior authorization from LSU. At the end of the one year period, either we or LSU may request an automatic extension for one additional year. At the end of the one year secure period (or its extension, if such is requested), the work will be released for access worldwide.

Committee Chair

Webster, Eric P.

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