A review of topramezone in sugarcane and potential carryover of post emergence soybean herbicides on plant cane

Authors: Spaunhorst, Douglas

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 2/14/2018
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: There are approximately 430,000 acres in commercial sugarcane production in Lousiana and methods to control weeds consist primarily of herbicides and tillage. Topramezone, the active ingredient in Armezon® received registration in sugarcane in fall of 2017. Data on sugarcane cultivar tolerance to topramezone is limited; therefore, two studies were conducted to evaluate L 01-299 and HoCP 96-540 plant cane tolerance to topramezone. Results from these studies show that topramezone did not reduce theoretical recoverable sucrose for L 01-299 or HoCP 96-540. In addition, cane and sugar yield for topramezone treatments were also not significantly less (p = 0.05) than the nontreated check. However, a treatment of 1 or 2 floz/ac of topramezone reduced L 01-299 cane yield and sugar yield by 4.5 ton/ac and 635 lbs/ac when compared to the nontreated check, respectively. HoCP 96-540 yield components were tolerant to treatments of topramezone. The 2 floz/ac treatment of topramezone reduced HoCP 96-540 cane yield and sugar yield no more than 0.3 ton/ac and 135 lbs/ac when compared to the nontreated, respectively. A second study was conducted to evaluate potential herbicide carryover injury to L 01-299 plant cane. Herbicide treatments (280 g ha-1 of acifluorfen, 272 g ha-1 of clethodim, 395 g ha-1 of fomesafen, 175 g ha-1 of lactofen, and 92 g ha-1 of quizalofop) were applied 45 days before sugarcane planting. The same herbicides were also applied directly after sugarcane planting. The aformentionded herbicides are labeled for grass and/or broadleaf weed control in soybean. Sugarcane shoot counts were simiar to the nontreated check at 6 weeks after planting when herbicide treatments were applied at 45 days before or at sugarcane planting. This data suggests it is unlikely that the herbicides: acifluorfen, clethodim, fomesafen, lactofen, and quizalofop; applied at rates in this study will reduce early-season L 01-299 plant cane shoot density.