Treesearch

Municipal programs to suppress Dutch elm disease have had highly variable results. Performance as measured by tree mortality was unrelated to control strategies. Costs for control programs were 37 to 76 percent less than costs without control programs in the 15-year time-span of the study. Only those municipalities that conducted a high-performance program could be expected to retain 75 percent of their elms for more than 20 to 25 years. Communities that experienced the fewest elm losses had a well founded program, applied it conscientiously and sustained their efforts over the years.

Uneven-aged management using a "q" technique for structure control is discussed for Appalachian mixed hardwoods. The success in attaining stand structure goals with periodic selection cuts was evaluated. Where these goals had not been reached, the authors speculated, on the basis of current stand conditions, whether they would be reached, and if so, when. For successful control of stand structure, reasonable guidelines must be used for choosing maximum size trees, residual basal area, and a "q" that is applicable to the tree species and stand conditions. Under this system of management,...

This paper presents 38 composite volume and value tables for hardwood pulpwood. Values are given for multiples of commonly used bolt lengths - 4, 5, and 8 feet - and may be applied, generally, to standing trees of all hardwood species. The volume tables resemble closely the Lake States Composite Volume Tables, but extend them to other units of measure: cubic feet, tons, cubic meters, and metric tons. The value tables give dollar values for individual trees at a wide range of pulpwood prices. Both sets of tables may be used with either entire trees or the pulpwood portions of sawtimber...

The line intersect method of sampling logging residues was tested in Appalachian hardwoods and was found to provide unbiased estimates of the volume of residue in cubic feet per acre. Thirty-two chains of sample line were established on each of sixteen 1-acre plots on cutover areas in a variety of conditions. Estimates from these samples were then compared to actual volumes obtained from a 100 percent cruise of each plot. No consistent bias was found; and, when species, slope, cutting method, road influence, and piece length were examined, their effects were found to be nonsignificant....

The authors outline a stand-evaluation method that stresses individuality by (1) making on-the-ground projections of individual tree development; (2) summarizing stand values in terms of the individual trees in the stand and their potential development; and (3) tailoring several management possibilities to an individual stand so the owner can choose among them.

Tree quatity index tables are presented for 12 important hardwood species of the oak-hickory forest. From these, tree value conversion standards are developed for each species, log grade, merchantable height, and diameter at breast height. The method of calculating tree value conversion standards and adapting them to different conditions is explained. A computer program for calculating tree values for different lumber values and conversion costs is included.

The PREVIEW computer program facilitates visual management of forested landscapes by generating perspective drawings that show proposed timber harvesting and regrowth throughout a rotation. Drawings show how changes would appear from selected viewing points and show landscapes as either a grid of distorted squares or by symbols representing trees, clearings, water, rock, etc. PREVIEW can also show roads and other linear features. PREVIEW requires digitized data for uniformly spaced points in a grid of up to 100 columns and 80 rows. For distorted square drawings, only elevations are needed....

American elm trees, Ulmus americana L., in Milwaukee, Wisconsin, were sprayed with methoxychlor by helicopter or mist blower once each year for 3 years to control the smaller European elm bark beetle Scolytus multistriatus (Marsham). Twig crotches were collected from sprayed trees each year for bioassay. Methoxychlor residues persisted for at least 1 year. There were differences in beetle control between spray techniques, but these differences decreased as years of successive spraying increased, suggesting that methoxychlor residues accumulate on elms. Tree surveys were made each year to...

In parts of Pennsylvania, oak regeneration after harvest cutting or natural disturbances has been very poor. Studies on the Tuscarora State Forest suggest that the primary cause of natural regeneration failure may be a lack of viable acorns; on some sites acorn insects and rodents destroy nearly all acorns, even in good seed years. Artificial regeneration is not without difficulties either: rodents were able to reach direct-seeded acorns even through plastic protectors; and planted seedlings have been severely damaged by deer browsing.

Uncertainty and inadequate information for prediction hinder attempts to judge the chances for success on logging jobs. In this study, variation in the success of commercial logging jobs in the Northeast was examined to relate the kinds of conditions present to the chances of logging being most successful under those conditions. Respondents rated half of the sample logging jobs most suceessful; they agreed that these jobs were excellent business ventures compared to other recent logging jobs. Splitting the sample on key variables substantially improved our ability to explain success on...