Pruning Dwarf Mistletoe Brooms Reduces Stress On Jeffrey Pines Cleveland National Forest California
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Author | : Robert F. Scharpf |
Publisher | : |
Total Pages | : 12 |
Release | : 1987 |
Genre | : Arceuthobium |
ISBN | : |
Western dwarf mistletoe (Arceuthobium campylopodum) is a damaging parasite of Jeffrey pines (Pinus jeffreyi) in southern California. Infected branches that develop into brooms are believed to reduce tlee vigor and increase mortality. Brooms were pruned from Jeffrey pines with varying levels of dwarf mistletoe infection and live crown. Many of the trees showed an increase in crown vigor when compared with unpruned trees after 5 years. Mortality was not reduced by pruning brooms, except during years of below-normal precipitation. Of the trees that died, most had little live crown, heavy dwarf mistletoe infection, and were also attacked by root diseases or insects or both. Reducing the stress of dwarf mistletoe by broom pruning to no less than 30 percent live crown helps to prevent mortality due to root disease and insect attack during years of below-normal precipitation.
Author | : Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.) |
Publisher | : |
Total Pages | : 8 |
Release | : 1987 |
Genre | : |
ISBN | : |
Author | : Robert F. Scharpf |
Publisher | : |
Total Pages | : 2 |
Release | : 1986 |
Genre | : Arceuthobium |
ISBN | : |
Many young, understory Jeffrey pines (Pinus jefreyi Grev. & Balf.) were found to be infected by western dwarf mistletoe (Arcerrthobium cantpylopodurn Engelm.) on Laguna Mountain, Cleveland National Forest, in southern California. Under heavily infected overstory, about three-fourths of the young pines (about 15 years old on the average) were infected by dwarf mistletoe. Infections per tree averaged about two and a half, two-thirds of these on the bole. Attempts to regenerate Jeffrey pine under an infected overstory in southern California will probably lead to a severely infected and damaged understory. Planting nonhost species or resistant selections of Jeffrey pine would be practical in managing dwarf mistletoe on these highly valuable forest recreational areas.
Author | : Robert F. Scharpf |
Publisher | : |
Total Pages | : 380 |
Release | : 1988 |
Genre | : Dwarf mistletoes |
ISBN | : |
Author | : Frank G. Hawksworth |
Publisher | : DIANE Publishing |
Total Pages | : 427 |
Release | : 1998-04 |
Genre | : |
ISBN | : 0788142011 |
Contents: generalized life cycle; sexual reproductive biology; mechanism and trends of evolution; biogeography and paleogeographic history; host relationships; ecological relationships; biotic associates; host-parasite physiology; anatomy of the dwarf mistletoe shoot system; endophytic system; pathogenic effects; control; systematics: philosophy, problems, and criteria for classification; molecular systematics; formal taxonomy. Extensive bibliography. Scientific and common names; collecting and curating techniques; herbaria consulted; specimens examined; glossary; subject and species indexes.
Author | : Robert F. Scharpf |
Publisher | : |
Total Pages | : 782 |
Release | : 1988 |
Genre | : Dwarf mistletoes |
ISBN | : |
Author | : Phillip M. McDonald |
Publisher | : |
Total Pages | : 96 |
Release | : 1986 |
Genre | : Douglas fir |
ISBN | : |
Author | : Robert F. Scharpf |
Publisher | : |
Total Pages | : 16 |
Release | : 1992 |
Genre | : Dwarf mistletoes |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 280 |
Release | : 1985 |
Genre | : Forests and forestry |
ISBN | : |
Author | : Philip M. McDonald |
Publisher | : |
Total Pages | : 796 |
Release | : 1980 |
Genre | : Clearcutting |
ISBN | : |
In a 1964-1967 study on the Challenge Experimental Forest, seedfall was evaluated in 2-, 5-, and 10-acre circular clearcuttings. During the 4 years, 10 seed crops, ranging from light to bumper, were produced by ponderosa pine. white fir, Douglas-fir, and incense cedar. Seedfall ranged from 76 to 40,691 sound seed per acre (188 to 100,547/ha) for a single species in a given year. From 89 to 100 percent of each species' seed fell within an area 1 1/2 times the height of the average dominant tree. Overall, seed distribution was highly variable.