Treesearch

In 1972, Gardona® WP was field tested against the gypsy moth, Porthetria dispar (L.), in Pennsylvania. Treatments of 1 gal/acre were applied by helicopter on six 100-acre plots, three at 1 pound AI/gal and three at 1.5 pound Al/gal. Check subplots of 0.1-acre were established throughout the area. Before and after spraying, evaluations were made by counting all visible egg masses and estimating defoliation to the nearest 10 percent. Kromekote cards and aluminum plates were used for qualitative and quantitative spray-deposit assessment. Leaves, soil, and water samples were collected at 1, 3,...

As forest management has grown more intensive in the cherry-maple and oak forests of the Allegheny region, the need for additional knowledge of the seeding habits of important tree species has become apparent. Reproduction of new stands after cutting depends, to a large extent, on an adequate seed supply. And seeds and friuts represent an important source of food for many species of wildlife.

A computer program for simulating harvesting operations is presented. Written in FORTRAN IV, the program contains subroutines that were developed for Appalachian logging conditions. However, with appropriate modifications, the simulator would be applicable for most logging operations and locations. The details of model development and its methodology are presented, along with generalized flow charts. Each component of the simulator (felling, skidding, etc.) is discussed individually. Input requirements and program output are presented in detail with the aid of information for an example...

Fifty-five tree and shrub species were evaluated on two surface-mine sites in eastern Kentucky. After 4 years' growth, comparison of survival and growth was used to identify the promising species for planting on acid surface-mine spoils. Three species of birch and three Eleagnus species survived and grew well on a range of sites. Noncommercial tree species and shrubs adapted to acid surface-mine spoils included silktree, tree-of-heaven, French tamarisk, Japanese fleeceflower, and Amur privet.

Compares a photographic technique with visual and dissection techniques for estimating egg density of the white pine weevil, Pissodes strobi (Peck). The relatively high correlations (.67 and .79) between counts from photographs and those obtained by dissection indicate that the non-destructive photographic technique could be a useful tool for determining egg density.

Lumber yields within lumber grades can be described by a multivariate linear model. A method for validating lumber yield prediction equations when there are several tree grades is presented. The method is based on multivariate simultaneous test procedures.

The amount of additional growth attributed to complete eradication of all woody understory vegetation varied for several widely scattered upland oak stands in the region. Based on paired-plot comparisons of 10 or more years' results, basal-area and cubic-volume growth usually increased slightly when the understory was eradicated. The amount of increase was related to (1) geographical stand location, (2) stand age, and (3) residual stocking of overstory trees. The greatest response to understory removal - an additional 0.75 square feet of basal area or abut 12 cubic feet per acre per year -...

This is a report on a survey of 2,213 households and their potential for entering the camping market in 1973. One out of every two households was found to be in one of three stages of the camping-involvement cycle. Active campers included 21 percent of the sample, up by 2 percent since 1971; inactive campers, 20 percent, up by 6 percent; and potential campers, 9 percent, down by 2 percent. Reasons for the increased numbers of inactive campers, and possible barriers between potential and active participation, are examined in detail. Twelve separate components of the popular image of camping...

Efficient unit-load handling with permanent pallets requires a well-organized pallet repair program. To provide basic infomation on pallet damage that could be used in establishing repair standards, we inspected a total of 1700 damaged pallets at four repair facilities. All damage was recorded by type, severity, and location. This survey determined that missing deckboards at the ends of the pallet account for more than 50 percent of the total deck damage and longitudinal breaks and splits outside the stringer notches account for more than 80 percent of the total stringer damage. This...

Dry lumber prices were applied to green and air-dried lumber that was measured with a dry board rule. Values were summed by species, lumber grade, and thickness class. Differences between green and air-dried lumber value have been termed value losses and are given in dollars and in percentages. The percentages have been separated into loss due to shrinkage and loss due to degrade. Data for 10 hardwood species are included.