Comparison of 2,4-D, dicamba and halauxifen-methyl alone or in combination with glyphosate for preplant weed control

Abstract

A field study was conducted in 2017 and 2018 to determine foliar efficacy of halauxifen-methyl, 2,4-D, or dicamba applied alone and in combination with glyphosate at preplant burndown timing. Experiments were conducted near Painter, VA, Rocky Mount, NC, Jackson, NC, and Gates, NC. Control of horseweed, henbit, purple deadnettle, cutleaf evening primrose, curly dock, purple cudweed, and common chickweed were evaluated. Halauxifen-methyl applied at 5 g ae ha-1 controlled small and large horseweed 89% and 79%, respectively, and was similar to control by dicamba applied at 280 g ae ha-1. Both rates of 2,4-D at 533 (Low Rate, LR) or 1066 (High Rate, HR) g ae ha-1 were less effective than halauxifen-methyl and dicamba for controlling horseweed. Halauxifen-methyl was the only auxin herbicide to control henbit (90%) and purple deadnettle (99%). Cutleaf eveningprimrose was controlled 74 to 85%, 51%, and 4% by 2,4-D, dicamba, and halauxifen-methyl, respectively. Dicamba and 2,4-D controlled curly dock 59 to 70% and were more effective than halauxifen-methyl (5%). Auxin herbicides applied alone controlled purple cudweed and common chickweed ≤ 21%. With the exception of cutleaf evening primrose (35%) and curly dock (37%), glyphosate alone provided ≥ 95% control of all weeds evaluated. These experiments demonstrate halauxifen-methyl effectively (≥ 79%) controls horseweed, henbit, and purple deadnettle, whereas common chickweed, curly dock, cutleaf evening-primrose, and purple cudweed control by the herbicide is inadequate (≤ 7%).

Sumatran fleabane (Conyza sumatrensis [Retz.] E. Walker) control in soybean with combinations of burndown and preemergence herbicides applied in the off-season

“…In the first application, when in combination with glyphosate + synthetic auxin, dicamba and triclopyr can be highlighted as partners of glyphosate. Other studies highlight dicamba (FLESSNER; ASKEW et al, 2021) or triclopyr (CANTU et al, 2021), in different combinations, especially with burndown and preemergences herbicides. Also, dicamba and triclopyr can be used as an alternative to 2,4-D, which were superior in this study.…”

Can pre- and/or post-emergent herbicide application affect soybean seed quality?

“…In grain farming, herbicides are often used in the off-season, primarily to manage difficult-to-control weeds, combining burndown with pre-emergent herbicides applied before planting (ALBRECHT et al, 2021). Dicotyledonous (dicot or broadleaf) weeds can be controlled using synthetic auxins, such as 2,4-D and dicamba (ASKEW et al, 2021;CANTU et al, 2021), among other broadleaf herbicides, including protoporphyrinogen oxidase (PPO) (COPES et al, 2021) or acetolactate synthase (ALS) inhibitors (KASPARY et al, 2021).…”

Evaluation the Efficiency of Newly Combined Herbicide Pyroxsulam and Galaxifen-methyl in Winter Wheat (Triticum aestivum L.)

“…], common ragweed (Ambrosia artemisiifolia L.), henbit (Lamium amplexicaule L.), purple deadnettle (Lamium purpureum L.), yet it is less efficient against Polygonum (Polygonum persicaria L., P. pensylvanicum L., P. hydropiper L., P. orientale L., pigweed (Amaranthus retroflexus L.), common chickweed [Stellaria media (L.) Vill.] (Askew et al, 2021).…”