Integrated management of scouringrush (<i>Equisetum hyemale</i>)

Scouringrush ( Equisetum hyemale L.) is an increasing problem in some fields. The objective of this research was to identify effective chemical and cultural methods for controlling scouringrush. A field experiment was conducted at three locations in southeastern Nebraska. Five herbicides (chlorsulfuron, dichlobenil, metsulfuron, MCPA, and triclopyr) were applied using a backpack sprayer, and were compared to competition with corn ( Zea mays L), repeated tillage, and repeated mowing. One year after treatments were applied, chlorsulfuron (158 g a.i. ha −1 ) reduced scouringrush biomass 100% and dichlobenil (6700 g ha −1 ) reduced biomass 70%. Repeated tillage or competition from a dense stand of corn reduced scouringrush biomass approximately 50%. Repeated mowing did not reduce scouringrush stem count or biomass. A greenhouse study was conducted to determine the effect of chlorsulfuron on corn and soybean ( Glycine max (L.) Merr.) growth when applied at rates necessary to control scouringrush. Both foliar- and soil-applied chlorsulfuron reduced corn and soybean biomass. Chlorsulfuron was the only treatment that completely controlled scouringrush but will have an adverse effect on corn and soybean growth.