Buctril (Herbicide)

Robert D. McLaughlin


Through a cooperative agreement between Rhone-Poulenc and Calgene, Inc., Rhone-Poulenc Ag Company is developing bromoxynil for use on cotton that has been genetically engineered to be resistant to postemergence over-the-top applications of bromoxynil, the active ingredient in BUCTRIL(ƒ) brand herbicide. Bromoxynil-resistant cotton will be marketed by Stoneville Pedigreed Seed Company, a wholly owned subsidiary of Calgene, Inc. BUCTRIL(ƒ) has been evaluated for use on this cotton by university researchers since 1991. When used as recommended, BUCTRIL(ƒ) provides excellent control of bristly starbur (Acanthospermum hispidum), coffee senna (Cassia occidentalis), common cocklebur (Xanthium strumarium), common ragweed (Ambrosia artemisiifolia), Florida beggarweed (Desmodium tortuosum), hemp sesbania (Sesbania exaltata), jimsonweed (Datura stramonium), pigweed species (Amaranthus spp.), morningglories (Ipomoea spp.), prickly sida (Sida spinosa), spotted spurge (Euphorbia maculata), spurred anoda (Anoda cristata), and velvetleaf (Abutilon theophrasti). Only the BUCTRIL(ƒ) Gel formulation of bromoxynil will be registered for the genetically engineered cotton. The proposed label includes effective BUCTRIL(ƒ) Gel rates for selected weed sizes. For effective control, pigweeds, spotted spurge and prickly sida should not exceed 2 inches in height at time of application. Other broadleaf weeds listed above can be effectively controlled at a larger stage of growth.

Based upon efficacy trials from 1991-1993, the first application of BUCTRIL(ƒ) is applied when cotton is 2-6 inches tall and a sequential application when cotton is 6-10 inches tall. However, BUCTRIL(ƒ) can be applied to this cotton from prior to emergence up to 60 days prior to harvest, and without injury to the crop. The maximum use rate must not exceed 0.5 lb ai/A per application with a maximum of 3 applications per use season.

A non-crop destruct EUP is anticipated for the 1994 use season with an expected Section 3 registration before the 1995 use season. University testing of BUCTRIL(ƒ) Gel on this cotton will be expanded in 1994.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pg. 82
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998