Hybridization of Western and Subalpine Larch

Paper published as Bulletin 37 in the UM Bulletin Forestry Series.https://scholarworks.umt.edu/umforestrybulletin/1021/thumbnail.jp

Noneffectiveness of Ribes eradication as a control of white pine blister rust in Yellowstone National Park

Eradication of Ribes spp. to control white pine blister rust in Yellowstone National Park was started in 1947. In 1968 this study was initiated to evaluate the previous control effort. Ribes eradication was suspended in 1968 in 18 white pine stands and Ribes and rust were allowed to increase within rust control units. Eleven stands outside eradication units were selected as checks. In 1968, and again in 1978, percent rust infection on pine and the importance of Ribes were determined. Neither rust nor Ribes increased during the 10-year period; both were essentially absent from the "eradicated" stands in 1968 and 1978. Even though Ribes populations were comparatively high in the noneradicated stands, incidence of rust was nearly absent. The data show that the eradication of Ribes in Yellowstone has had little or no effect on spread and intensification of rust in the Park

Monitoring fluoride pollution in Flathead National Forest and Glacier National Park, 1972

During August 1972, 15 vegetation plots monitered for foliar fluoride concentrations in 1971 were resampled near the Anaconda aluminum plant at Columbia Falls, Montana. Statistical analysis of the data showed that essentially the same amount of fluoride was taken in by conifers, shrubs, and grasses in 1972 as in 1971. It is concluded that the area over which plants accumulated fluoride and resultant damage occurred remained unchanged from 1971 at 179,000 acres and 15,000 acres, respectively. Vegetation in Glacier National Park continued to show some fluoride injury and to accumulate abnormally high amounts of fluoride