• Effects of Leaf-Footed Bugs on Mesquite Reproduction

      Ueckert, D. N. (Society for Range Management, 1973-05-01)
      Leaf-footed bugs, Mozena obtusa Uhler, were observed feeding on immature mesquite pods in the Rolling Plains of Texas. A sleeve cage study, using various population densities of these insects, showed that their feeding significantly increased the abortion of immature mesquite pods while decreasing the dry weight of pods and seeds and the germination percentage of seeds. Seedlings from seeds fed upon by this insect were significantly smaller and less vigorous than those from bug-free seeds. This insect may limit the reproduction of mesquite and may offer a possibility for the utilization of a native insect for the control of a native weed.
    • Effect of Plant Moisture Stress on Carbohydrate and Nitrogen Content of Big Sagebrush

      Dina, S. J.; Klikoff, L. G. (Society for Range Management, 1973-05-01)
      Delineation of the effects of plant moisture stress on carbohydrate and nitrogen content of important range species is needed for proper intensity of range use of summer ranges when high plant water stress conditions exist. Water potential of big sagebrush shows great seasonal variation, ranging from a low of -70.3 bars in September to a high of -8.3 bars in April. Starch content did not significantly change in water stressed plants, but sugar content significantly increased in leaves, stem, and roots. Leaf nitrogen content significantly decreased in water stressed plants, while stem nitrogen content significantly increased. Sugar increases in the leaves, stem, and roots and nitrogen accumulation in the stem of water stressed plants may be of adaptive significance.
    • Brush Eradicating, Basin Pitting, and Seeding Machine for Arid to Semiarid Rangeland

      Abernathy, G. H.; Herbel, C. H. (Society for Range Management, 1973-05-01)
      A range seeding machine that increased the chances of successful seedling establishment on arid to semiarid rangeland has been designed and tested on 23 plots in southern New Mexico. Working behind a standard rootplow, the machine picks up brush, forms basin pits, firms the soil, plants seed, and replaces the brush over the planted area as a mulch. Laboratory and field research was used to demonstrate improved soil conditions for seedling emergence under such a brush mulch. Water retention by basin pits was found to be necessary to decrease runoff of the high intensity, short duration storms typical to this area. About 50% of the plots planted with this equipment were successfully seeded.
    • A Modification of the Slanting Deer Fence

      Messner, H. E.; Dietz, D. R.; Garrett, E. C. (Society for Range Management, 1973-05-01)
      A slanting deer fence is designed that requires less mesh wire and shorter posts than the standard upright deer fence. The slanting fence blends well into forest and meadow backgrounds and will withstand greater snow loads than existing slanting deer fences.