Roughleaf dogwood (Cornus drummondii C.A. Mey.) is one of the most problematic native woody plants in rangelands of Kansas. Lack of prescribed burning due to drought and urban encroachment has contributed to its spread. Herbicides have commonly been used for control of roughleaf dogwood, and tebuthiuron pellets (Spike 20P) are often recommended. Baseline measurements of density and cover were taken on October 15, 2004. Treatments of 4.4 kg ai/ha (3/4 oz per 100 square feet) tebuthiuron pellets were applied in December 2004. Paired plots, treated and untreated, were 5 by 10 meters in size and were replicated eight times. Live dogwood stem counts were taken along a 0.5 by 10-m belt transect within each plot. A total of five individual, 0.1-m2 frames per plot were used to estimate woody plant cover using the Daubenmire Canopy Coverage method. Woody plant cover and roughleaf dogwood density were taken again on August 24, 2006. A visual estimate of control indicated tebuthiuron reduced dogwood cover by 65% compared to a 3% decrease on untreated plots. Dogwood live stem density was reduced by 2.2 stems/m2 (P<0.08) in treated plots. Total woody plant cover increased on untreated plots by 6.2 percentage units, but was decreased by 20.9 percentage units on tebuthiuron treated plots. Other woody plants decreased in both treated and untreated plots. Shading by a large elm tree likely caused variation between replications including increases in cover and density of roughleaf dogwood on treated plots. Tebuthiuron pellets applied at 4.4 kg ai/ha appears to be an effective control option for roughleaf dogwood.
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