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Evaluating DuraCor in Florida Pasture Weed Management

Applied Research

Caetano Sales
Ag and Natural Resources Extension Agent
UF/IFAS
Lecanto

Abstract

Hard to control pasture weeds is an issue for Florida cattle producers. Two problematic weeds are tropical soda apple (Solanum viarum) and dogfennel (Eupatorium capillifolium). DuraCor is a premix of florpyrauxifen-benzyl & aminopyralid, promoted as a new resource for pasture weed management. However, limited research has been done to determine if this premix effectively controls Florida pasture weeds and if tank-mix partners are required for optimum weed control. Therefore, experiments were conducted at Limestone, FL (dogfennel at 12 inches tall) and Lake Wales, FL (dogfennel at 35 inches tall and tropical soda apple at 16 inches tall) to determine the efficacy of DuraCor alone and with tank-mixes. Visual evaluations of weed control were performed at 30, 60, and 120 days after application (DAT). Treatments were applied using methylated seed oil (MSO) at 1% v/v and a non-ionic surfactant (NIS) at 0.25% v/v as adjuvants. In general, the addition of PastureGard HL at 8 fl oz acre-1, WeedMaster at 48 fl oz acre-1, and 2,4-D at 48 fl oz acre-1 improved dogfennel control over that with DuraCor alone at 16 fl oz acre-1. Control was similar to that provided by the standard tank-mix of GrazonNext HL + PastureGard HL at 24 + 8 fl oz acre-1. MSO provided better initial dogfennel control by 30 DAT, though there was no adjuvant effect by 60 DAT at Limestone. DuraCor alone and with tank-mixes provided at least 85% control to TSA at Lake Wales, except when tank-mixed with 2,4-D, which resulted in no greater than 57% by 30 DAT. Adjuvant type does not appear to impact tropical soda apple control. After the first evaluation, frost precluded further data collection at the Lake Wales location. Overall, these data suggest that TSA is susceptible to DuraCor; however, tank-mix partners are necessary for optimum dogfennel control. Furthermore, this new herbicide combination with a tank-mix partner provides a similar control of dogfennel and tropical soda apple as compared to the standard tank-mix of GrazonNext HL + PastureGard HL.

Poster has NOT been presented at any previous NACAA AM/PIC

This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.

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Authors: Caetano Sales, Brent Sellers, Pratap Devkota, Marcello Wallau
  1. Sales, C. Agriculture and Natural Resources Extension Agent, University of Florida IFAS Extension, Florida, 34461
  2. Sellers, B. Professor and Director, UF/IFAS Range Cattle Research and Education Center, Florida, 33865
  3. Devkota, P. Assistant Professor/Weed Scientist, UF/IFAS West Florida Research and Education Cente, Florida, 32565
  4. Wallau, M. Assistant Professor/Forage Extension Specialist, UF/IFAS Agronomy Department, Florida, 32603