Response ofMiscanthus × giganteusandMiscanthus sinensisto Postemergence Herbicides

Abstract

Studies were conducted under greenhouse conditions at Michigan State University and Texas Tech University to investigate the tolerance ofMiscanthus × giganteusandMiscanthus sinensisto POST herbicides.Miscanthus sinensisandM. × giganteuswere treated with 10 and 18 POST herbicide treatments, respectively. Plants were evaluated for injury as well as dry aboveground and belowground biomass production 28 days after treatment. Imazethapyr at 0.069 kg ai ha−1caused 5% injury toM. sinensis, which was greater than the nontreated check. Imazethapyr, imazamox at 0.044 kg ai ha−1, and rimsulfuron at 0.017 kg ai ha−1reduced aboveground biomass ofM. sinensiscompared with the nontreated check. Dicamba at 0.56 kg ai ha−1and halosulfuron at 0.035 kg ai ha−1resulted inM. sinensisaboveground biomass similar to the nontreated check. Injury exhibited byM. × giganteuswas greater than the nontreated check with glyphosate at 0.84 kg ae ha−1(54%), foramsulfuron at 0.037 kg ai ha−1(32%), nicosulfuron at 0.035 kg ai ha−1(28%), and imazamox at 0.044 kg ai ha−1(10%). These treatments also yielded the lowest aboveground biomass values. The results of this study demonstrate thatM. sinensisis more tolerant of the POST herbicides tested here thanM.×x. giganteus. Several herbicide options may be available for weed management inM. sinensisandM. × giganteusstands following additional field trials to validate initial findings.