Treesearch

American elm trees, Ulmus americana L., were sprayed with methoxychlor by helicopter or mist blower, and twig crotches were collected from sprayed trees for bioassay of Scolytus multistriatus (Marsham) and GLC assay. Correlations established between the 2 assays were dependent on method of application and amount of methoxychlor residue. Correlations were low and variable for helicopter-sprayed trees and high and uniform for mist-blower-sprayed trees.

To evaluate fall versus spring planting of 10 coniferous tree species and 5 hardwood shrub species, experimental plantings were established over a 2-year period on 7 graded strip-mine spoils. In general, initial tree survival was better with spring planting than with fall planting, especially on the more acid sites. Shrubs survived well with both spring and fall planting on the better sites, but spring planting of shrubs was more successful on the more acid sites. Season of planting had no significant effect on fifth-year height of either trees or shrubs.

Red pine (Pinus resinosa Ait.) and Japanese larch (Larix leptolepis (Sieb. and Zucc.) Gord.) seedlings were planted on coal-breaker refuse with all combinations of two levels of lime, two levels of fertilizer, and four mulch treatments. The site was highly unfavorable as a medium for tree growth, and the 4-year results show that: lime application was essential for adequate survival and establishment of both species; neither mulch nor fertilizer treatments contributed substantially to tree establishment and height growth; and after 4 years, the pH values are still neutral in the top 4 in....

A multiple-variable screening technique, AID, was used to explain the forest-product-sales behavior of private woodland owners. Results provide a basis for policy-related inferences and suggest an optimal strategy for encouraging sales of forest products.

Data on lumber grade yields for subfactory class logs are presented for ten species of hardwoods. Eogs of this type are expected to assume greater importance in the market. The yields, when coupled with lumber prices, will be useful to sawmill operators for developing log prices in terms of standard factory lumber.

The authors present a method for projecting hardwood sawtimber tree values, using tree-development probabilities based on continuous forest inventory (CFI) data and describe some ways to use the resulting value projections to assemble management-planning information.

Five years after crop-tree release of yellow-poplar and black cherry sterns in a 7-year-old stand of Appalachian hardwoods, measurements indicated that released trees were but slightly superior to control trees in height, diameter, and crown position. Sprout regrowth of cut tree stems and grapevines had largely nullified the effects of release. Indications are that for release to be effective, crop trees of these species on good sites should be 15 to 20 feet tall.

A study of the camping market's short-term growth potential, based upon interviews with the heads of 2,003 representative American households. The study estimates the size of the potential camping market and divides it into three segments: those families with a high, medium and low propensity to become campers. The developed camping market is also divided into an active and an inactive segment, determined by camping participation during the 12 months preceding the survey. The total camping market is estimated to include 12.6 million active camping families, 9 million inactive, and 10...

Describes a procedure for identifying regional opportunities for accelerated timber management and demonstrates its application. Results provide a basis for rational choices among alternative management strategies and permit meaningful micro- and macro-evaluations of treatment response.

Presents financial-maturity information for sugar maple, based on tree growth and tree-quality data collected in Pennsylvania and West Virginia. Detailed rates of value increase and dollar value increase to be expected for a 10-year period are exhibited. Marking guides in the form of financial-maturity diameters are developed. The effects on financial aturity of operating at different levels of conversion costs and changing costs and prices are analyzed.