Treesearch

All dwarf mistletoes are parasites that extract water, nutrients, and carbohydrates from the infected host; they are also pathogens that alter host physiology and morphology (Gill and Hawksworth 1961, Hawksworth and Wiens 1996). Disease or direct effects are reductions in diameter and height increment, survival, reproduction, and quality; witches’ brooms are formed in many pathosystems (Knutson and Tinnin 1980). Where dwarf mistletoe populations develop significant, long-term infestations, cumulative tree damages have various ecological and evolutionary effects. Depending on management...

The generally familiar mistletoes are the leafy Phoradendron that typically infest hardwood trees and are placed at doorways for winter celebrations. Several of these mistletoes, however, more resemble the dwarf mistletoes by their apparently leafless stems and presence on conifers; but their large, fleshy berries that are attractive to birds clearly identify them as Phoradendron, “the tree thief.” For several reasons, the conifer-infecting Phoradendron (the group reviewed here) have not gotten the level of attention from forest managers that the Arceuthobium have. Phoradendron most...

The biology, pathology, and systematics of dwarf mistletoes are recently and well reviewed in Hawksworth and Wiens (1996). That monograph forms the basis for the text in this and chapter 5 and should be consulted for more information (for example, references, photographs, and distribution maps). In addition to extracting the information that would be most relevant to forest managers and arborists, we here include new references on hosts, distributions, and ecology. The synonymy in this chapter is neither formal nor complete; rather, we provide additional names used in previous, significant...

The Psittacanthus, parrot-flower, is the only genus of the family Loranthaceae that is significant to conifer forestry in North America. These mistletoes do not occur in Canada or the United States; and in Mexico, they are only important in central and southern portions. Psittacanthus also occurs in Central America (rarely on conifers) and other regions of the tropical New World where these mistletoes achieve their greatest diversity and abundance on numerous hardwoods. Plants are showy (fig. 2-1), become quite large, and are locally abundant. They are damaging to conifers, but they also...

This proceedings is a compilation of 33 papers that were presented at the regional meetings of the forest and conservation nursery associations in the United States in 2002. The joint meeting of the Southern Forest Nursery Association and the Northeastern Forest and Conservation Nursery Association was held at the DoubleTree Hotel and Conference Center in Gainesville, Florida on July 15 to 18. The meeting was hosted by the Florida Division of Forestry, Andrews Nursery. In addition to technical sessions, tours included Andrews Nursery and Stansel Farm & Nursery. The combined meeting of the...

There are growing pressures on undeveloped (wild) places in the Circumpolar North. Among them are pressures for economic development, oil and gas exploration and extraction, development of geothermal energy resources, development of heavy industry close to energy sources, and lack of appreciation for "other" orientations toward wilderness resources by interested parties from broad geographical origins. An international seminar in Anchorage, Alaska, in May of 2001, was the first step in providing basic input to an analysis of the primary set of values associated with Circumpolar North...

We assessed the usefulness of Terrestrial Ecosystem Survey (TES) data as a means of identifying habitat for the Mexican spotted owl (Strix occidentalis lucida) in three National Forests in Arizona. This spatial data set incorporates information on soils, vegetation, and climatic conditions in defining a set of ecological "map units" showing potential vegetation. We used three separate data sets consisting of spotted owl locations resulting from: (1) U.S. Forest Service (USFS) surveys; (2) mark-recapture sampling of 12 randomly selected "quadrats" ranging from 40 to 76 km2, conducted in...

This report presents a summary of the most recent inventory information for Arizona's forest lands. Much of the data are from the inventory completed in 1999 that included National Forest System lands and reserved lands. This report includes tables and highlights of area, number of trees, biomass, volume, growth, mortality, successional stage, understory vegetation, removals, and net change. Most of the tables are organized by forest type, species, diameter class, or owner group. The report also explains inventory design and inventory terminology, and discusses data reliability. Results...

Long-term measurements and repeat photograph collections have been collected in a systematic manner on the approximately 21,000 ha Santa Rita Experimental Range (SRER) since its establishment in 1903. This research facility, located in the Desert Grassland vegetation of southern Arizona, was administered by the U.S. Department of Agriculture until 1988, when it was transferred to the State of Arizona to be administered by the University of Arizona, College of Agriculture and Life Sciences. To facilitate the preservation of the long-term data collected on the SRER and to increase access to...

The USDA Forest Service completed its Strategic Plan (2000 Revision) in October 2000. The goals and objectives included in the Plan were developed with input from the public, some of which was obtained through a telephone survey. We report results of the survey. Members of the American public were asked about their values with respect to public lands, objectives for the management of public lands, beliefs about the role the agency should play in fulfilling those objectives, and attitudes about the job the agency has been doing. The public sees the promotion of ecosystem health as an...