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Journal of Range Management, Volume 28, Number 4 (July 1975): Recent submissions
Now showing items 21-24 of 24
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Arthropods Associated with Two Crested Wheatgrass Pastures in Central MontanaTwo pastures of crested wheatgrass in central Montana were surveyed for arthropods from May 10 through September 30, 1972, and 1973. A vacuum quick trap and the bagging of individual plants showed that five groups of arthropods were important on the basis of abundance and above-ground biomass: grasshoppers, ants, leafhoppers, thrips, and mites. Adults of the first three groups were identified to species.
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Areas of Molybdenum Toxicity to Grazing Animals in the Western StatesThe geographic distribution of molybdenum (Mo) areas toxic for grazing animals was determined in five western states-Washington, Idaho, Montana, Wyoming, and Colorado. A number of relatively extensive areas producing forage plants with 10 to 20 ppm or more of Mo, levels well within the toxic range for grazing animals, was found. A history of a nutritional problem in animals was found to be associated with most of these areas. The characteristics of these areas are described and levels of Mo in forage plants as well as those of Cu are given. The concentration of Cu in forage plants was nearly the same whether the plants had small or large amounts of Mo.
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Alkaloid Content of Duncecap Larkspur after Two Years of ClippingDuncecap larkspur plants clipped in vegetative growth stage (late June) for 2 consecutive years produced only leaves and no flower stalks the third year. These plants were significantly smaller and contained a significantly lower concentration of total alkaloids than those plants clipped later in the summer or than unclipped control plants. This susceptibility to injury by clipping may help interpret results of other control methods. Total alkaloid content of previously unclipped larkspur plants was highest in the early growth stages and declined throughout the summer. Total alkaloid content in late June ranged from 1.7% to 2.8% and was not correlated with amount or pattern of precipitation.
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Aerial Application of 2,4-D Plus Picloram for Green Rabbitbrush ControlAn aerially applied mixture of 2,4-D and picloram was more effective than 2,4-D alone in controlling green rabbitbrush and big sagebrush in a very droughty big sagebrush/desert needlegrass community. Herbage production had more than doubled by 5 years after the brush stand was reduced. Needleandthread was the only species to increase in density because of brush control, although considerable seed was produced from other perennial grasses. Modification of the seedbed environment is apparently necessary to establish additional desert needlegrass or Indian ricegrass plants.
