Response of Two Yellow Nutsedge Varieties to Three Herbicides

In greenhouse studies,Cyperus esculentusL. var.esculentuswas less susceptible thanC. esculentusL. var.leptostachyusBoeck. to preplant applications of 1.77 kg/ha of atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] or 0.5 kg/ha of metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazine-5-(4H)one].C.var.esculentuswas more susceptible thanC.var.leptostachyusto postemergence applications of 2,4-D [(2,4-dichlorophenoxy)acetic acid] oil-soluble amine.C.var.esculentushad longer, slightly narrower, and more upright leaves; generally fewer but larger tubers; fewer rhizomes; and a lower frequency of flowers with less seeds per inflorescence thanC.var.leptostachyus.Publications onC. esculentusshould specify which variety was used.