• Control of Mixed Brush with Tebuthiuron

      Scifres, C. J.; Mutz, J. L.; Hamilton, W. T. (Society for Range Management, 1979-03-01)
      Tebuthiuron pellets, 10 or 20% active ingredient, aerially applied at 2.24 kg/ha active ingredient resulted in excellent control of whitebrush, spiny hackberry, and Berlandier wolfberry in South Texas mixed brush. At 2.24 to 3.36 kg/ha active ingredient, the herbicide appears promising for control of lotebush, blackbrush acacia, ceniza, Texas colubrina, javalinabrush, guajillo, guayacan, desert yaupon and twisted acacia. Rates of 3.36 to 4.48 kg/ha active ingredient, applied as tebuthiuron pellets, appeared promising on huisache but only partially controlled honey mesquite. Tebuthiuron was ineffective on lime pricklyash, Texas persimmon, pricklypear, and tasajillo.
    • Influence of Brush Control on White-tailed Deer Diets in North-Central Texas

      Quinton, D. A.; Horejsi, R. G.; Flinders, J. T. (Society for Range Management, 1979-03-01)
      Botanical composition of white-tailed deer fecal pellets from untreated and brush-controlled areas of the Texas Rolling Plains was studied by microscopic analysis. Deer showed a marked preference for 11 of 54 plant species selected as food from a total of 250 identified on the study area. The bulk of the diet was comprised of mistletoe on non-brush control areas and of prickly-pear on brush-controlled areas. Similarity indices relating habitat across diets as well as diets across a habitat indicated that several habitats had preferred foods removed. These habitats also had low populations of deer. Brush control involving limited removal of noxious species affected dietary selection of deer but did not appear to affect overall deer usage of the habitats studied.
    • Variability in Predicting Edible Browse from Crown Volume

      Bryant, F. C.; Kothmann, M. M. (Society for Range Management, 1979-03-01)
      Biomass estimates were made with regression techniques using crown volume and weight relationships. The log-log function yielded the highest coefficient of determination for Vasey shin oak, plateau oak, Texas persimmon, and honey mesquite. A quadratic function was best for wollybucket bumelia, littleleaf sumac, agarito, and pricklyash. Sugar hackberry showed equally high coefficients with either the linear or quadratic. Coefficients of determination for catclaw acacia, elbowbush, and skunkbush sumac generally were low regardless of the type of regression equation used. When sampled at various periods over the year, predictive accuracy declined for Vasey shin oak and plateau oak through fall and winter but rose again in spring and early summer. For both species, the log-log function was best from late summer to winter but during spring and early summer the quadratic function was best.