Abstract
Brush invasion is a problem on some grazing land in Kansas. A study was initiated on two sites in the northern Flint Hills to determine the effectiveness of tebuthiuron for controlling selected woody species and the associated effect on botanical composition and basal cover. Tebuthiuron pellets (20% a.i.) were aerially applied to 4 ha plots at each site at 2 kg/ha in December, 1979. Tebuthiuron reduced the canopy covers of Siberian elm (46%) and Osage orange (44%) 46 months after treatment at the Geary County site. Canopy covers of Siberian elm, smooth sumac, and eastern cottonwood were reduced > 50% 45 months after treatment at the Pottawatomie County site. A decrease in basal cover on the treated sites was not significantly different from a corresponding change on adjacent untreated sites. Setaria spp. increased on the tebuthiuron-treated site in Geary County, whereas sedge, Scribner panicum, and Japanese brome decreased between the first and second growing seasons after application. The 2 kg/ha rate used in this study, in conjunction with low rainfall and high organic matter and clay content of soils, was not adequate for complete control of the target species.
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