E de la Garza Institute for Goat Research Langston University
Workshops & Field Day Newsletter Newsletter Subscription Demonstrations Demonstrations Langston University Research Building
Goat Menu




A comparison of herbicide, goats, and mowing for control of woody vegetation species

S. P. Hart, J. Joseph, A. L. Goetsch, and J. Brokaw

E (Kika) de la Garza American Institute for Goat Research, Langston University, Langston, OK

The objective of this study was to compare herbicide, goats, and mowing for control of woody vegetation species and their impact on herbaceous species. The study site was a native tallgrass prairie that had been invaded by woody species, predominantly blackberry, buckbrush, winged elm, and sumac. Two replicate 2.0-ha pastures were fenced with electric fence for containment of goats. Replicate 0.4-ha plots were used for control, mowing, and herbicide treatments. The mowing treatment consisted of mowing to a 15-cm height in the middle of the growing season each year. The herbicide treatment consisted of 1.2 L of Grazon P+D and 1.2 L of Remedy in 200 L of water/ha applied during the growing season each year. Goats were stocked for two summers, starting in early June, and were removed from the plots in the fall. The stocking rate was 15 and 10 hd/ha in the first and second year, respectively. Woody vegetation cover was measured by the line intercept method on five 30-m permanent transects per pasture and herbaceous species composition was measured by identification of plant species at 0.3-m intervals of the transect. Herbicide treatment reduced ground cover of blackberry (17.7 vs 1.9%; P < 0.10), flame leaf sumac (16.2 vs 0%; P < 0.10), smooth sumac (1.2 vs 0%; P > 0.10), rose (5.7 vs 2.0%; P > 0.10), and sassafras (1.1 vs 0%; P > 0.10), but winged elm, buckbrush, and greenbriar were not controlled by herbicide. Goats reduced percent ground cover of blackberry, (18.5 vs 13.7%; P < 0.10), sumac (21.1 vs 17.0%; P > 0.10), rose (3.7 vs 2.2%; P > 0.10), poison ivy (1.5 vs 0.7%; P > 0.10), and dogwood (9.1 vs 4.2%; P > 0.10), but buckbrush (25.1 vs 33.3%; P > 0.10) and persimmon cover (2.9 vs 5.7%; P > 0.10) increased despite being defoliated by goats. Only ground cover of buckbrush and flameleaf sumac were decreased by mowing (1.4 vs 0 and 10.2 vs 4.2%, respectively; P > 0.10). Grazing by goats reduced cheat, broomsedge, bluestem, hogwort, and sericia lespedeza as a percent of species present; however, Scribners panic, velvet panic, and black medic were increased. Mowing reduced percentages of common yarrow and inland rush, but increased sedge, bermudagrass, Scribners panic, velvet panic, and beaked panic grass. Herbicide reduced percentages of common yarrow, hogwort, and yellow oxalis, but increased cheat, Scribners panic, beaked panic, and tall fescue. In this two year study, herbicide was very effective at reducing woody species and goats were more effective than mowing, although the effectiveness of goats was limited by the short duration of the study.


Extension Activities   |   Research Activities   |   Other Activities
Library Activities   |   Quiz   |   Search   |   About Us   |   Contact Us   |   Faculty & Staff
Research Extension Home   |   Top of Page

Copyright© 2000 Langston University   &149; Agricultural Research and Extension Programs
P.O. Box 730  &149; Langston, OK  73050 &149; Phone 405.466.3836