Treesearch

Previously unmanaged 60-year-old, even-aged stands of cherry-maple in West Virginia were thinned using the Allegheny hardwoods stocking guide. A marked cut was computed for 75, 60, and 45 percent of full stocking; no trees smaller than 17.8. cm dbh were marked for commercial removal. Thinning was done with either a truck-mounted crane or a rubber-tired skidder.

Nearly 500,000 acres of nonindustrial private forestland have been brought into higher levels of timber production through long-term increment-based cutting contracts involving local woodland owners and large wood products firms in the South. Through personal interviews with forest industry executives and professional consulting foresters, this study examined the qualitative factors which affect the feasibility of implementing the increment contract in the central Appalachians (Pennsylvania, West Virginia, Virginia, and North Carolina) as a means of improving timber production on small...

Traces the history of USDA Forest Service fire reports, examines the most recent report, Form 5100-29, and discusses the reliability of information recorded on the 5100-29, factors influencing data accuracy, and reactions of the Ranger District personnel to wildfire reporting.

The fourth inventory of Michigan's forest resources shows a 27 percent increase in growing-stock volume between 1966 and 1980, from 15.0 to 19.1 billion cubic feet.

Heights were measured and white-pine weevil (Pissodes strobi (Peck)) attacks were recorded on 668 western white pines (Pinus monticola Douglas) interplanted among 109 eastern white pines (Pinus strobus L.) in a 10-year-old plantation in southern Maine. Less than 13 percent of the western white pines were successfully attacked (leader killed) by the weevil. Weevils killed the leader on 63 percent of the eastern white pines. Eastern white pine was the taller of the two species, but 3 open-pollinated families of western white pine from New York-grown parents and 1 of 12 familes from Idaho-Mont...

The Douglas-fir tussock moth (Orgyia pseudotsugata McDunnough) is an important defoliator of true firs and Douglas-fir in Western North America. Severe tussock moth outbreaks have occurred in British Columbia, Idaho, Washington, Oregon, Nevada, California, Arizona, and New Mexico, but the area subject to attack is more extensive

The Canada-United States Spruce Budworms Program (CANUSA) is a 6-year joint effort by the Department of the Environment, Canada, and the USDA Forest Service to develop methods for controlling spruce budworms in the Eastern and Western United States and in Canada.

Biological control, one component of integrated pest management, encompasses the use of several types of biological agents to control insect pest populations. Of these biological control agents, the insect viruses appear to offer one logical alternative to the chemical insecticides. One such virus, the nucleopolyhedrosis virus of the gypsy moth, Lymantria dispar (Linnaeus), is discussed in depth in regard to the research leading to its approval as an insecticide against its host.

Traditionally, dieback and decline diseases of trees have been described in generalities, attributed to unknown or mysterious causes, and thought to be beyond the scope of human intervention. This publication provides a basis for understanding and coping with these diseases. Discussed are concepts relating to: (1) diagnosing the factors that initiate the disease; (2) describing symptoms and disease development; (3) determining the role of secondary-action organisms; and (4) developing appropriate control measures. The concepts presented here are drawn from more than 15 years of research on...

Average 4-year-height of 199 hybrid poplar clones ranged from 5.1 to 26.0 feet in Pennsylvania and 5.6 to 22.7 feet in Maryland. Several rapid-growing clones grew well at both locations, but height growth was affected by interactions of clones and location. The clones that grew best on both sites averaged 4 to 6 feet of height growth per year.