Activity of Isoxaflutole plus Metribuzin Tankmixes in Isoxaflutole-Resistant Soybean

Abstract

Isoxaflutole-resistant soybean is currently in development for commercialization in North America. Proposals to use isoxaflutole + metribuzin as the main herbicide tank-mixture raise concerns as there is limited grass control with these herbicides. Strategies are needed to improve grass control with isoxaflutole + metribuzin. Nine experiments were conducted over a two-year period (2017, 2018) to determine the efficacy of isoxaflutole + metribuzin (52.5 + 210 g a•i• ha −1) applied alone and co-applied with pendimethalin, dimethenamid-P, pethoxamid, pyroxasulfone or S-metolachlor applied preemergence (PRE). Comparisons were made with isoxaflutole + metribuzin at a low rate (52.5 + 210 g a•i• ha −1), medium rate (79 + 315 g a•i• ha −1) and a high rate (105 + 420 g a•i• ha −1). Eight weed species were evaluated including common lambsquarters, green and redroot pigweed, common ragweed, velvetleaf, green and giant foxtail, yellow foxtail, barnyardgrass and witchgrass. All herbicides were affected by amount of rainfall following application; less rainfall resulted in reduced weed control. The addition of pendimethalin, dimethenamid-P, pethoxamid, pyroxasulfone or S-metolachlor to the low rate ofisoxaflutole + metribuzin provided equivalent control of all weed species evaluated compared toisoxaflutole + metribuzin at the low, medium, or high rate.

Respon gulma dan tanaman akasia terhadap aplikasi herbisida pra tumbuh

“…Pengaplikasian dapat dilakukan pada permukaan tanah atau langsung pada gulma. Bahan aktif Isoxaflutole efektif mengendalikan gulma berdaun lebar dan juga efektif dalam mengendalikan gulma rerumputan atau gulma berdaun sempit (Smith et al, 2019) Flumioxazin merupakan herbisida non selektif. Dengan kata lain herbisida ini efektif mengendalikan gulma dari golongan daun lebar, rumput, dan teki.…”

“…Isoxaflutole adalah herbisida pra tumbuh yang digunakan untuk mengendalikan gulma berdaun lebar meskipun juga efektif dalam mengendalikan gulma rerumputan atau gulma berdaun sempit (Smith et al, 2019). Herbisida ini dapat menyebabkan gejala pemutihan pada gulma yang rentan.…”