Treesearch

Three different methods of sawing the SHOLO log were compared on a board-foot yield basis. Using sawmill simulation, all three methods of sawing were performed on the same sample of logs, eliminating differences due to sapling. A statistical test was made to determine whether or not there were any real differences between the board-foot yields. Two of the sawing methods provided about the same board-foot yields; one provided about 40 percent less.

As an aid to studying vertebrate predators of the gypsy moth, a radio telemetry system was designed to detect the death of small mammals and facilitate recovery of the remains. An intraperitoneally implanted radio transmitter is triggered by the drop in body temperature when the animal dies. The device was tested in white-footed mice.

In 9 years of study in Maine, the author developed a survey method for estimating populations of yellow-bellied sapsuckers (Sphyrapicus varius varius L.) and delineating their territories. The birds were attracted for study by tapping hardwood dowels to imitate noises the birds make in drumming and feeding.

Guidelines are presented for determining dollar losses in residential property values from tree mortality caused by the gypsy moth. The method is based on an earlier study in Amherst, Massachusetts, of the contribution of trees to property values. For each target area, the method requires data on property value, lot size, and number of trees 6 inches dbh and larger for a sample of residential properties. Also required are predictions of tree mortality from a gypsy moth attack.

This report is an attempt to integrate and summarize research results from studies made mostly in West Virginia and to show the relationship of site quality and cutting practices to hardwood reproduction, with special emphasis on species composition. Reproduction has been found satisfactory in numbers and distribution after both clearcutting and selection cutting, but the species composition differs greatly: shade-tolerant species predominate after selection cutting, but generally a good proportion of the regeneration that follows clearcutting will be composed of intolerant species -...

American elm trees, Ulmus americana L., were sprayed with different formulations of methoxychlor by mistblower, hydraulic sprayer or helicopter. Twig-crotches were collected from sprayed trees for GLC assay and Scolytus multistriatus (Marsham) bioassay. Hydraulic deposits were heaviest but the mistblower was more efficient in terms of amount deposited per pound of methoxychlor sprayed. Helicopter deposits were light on lower branches but were comparable to mistblower and hydraulic deposits in tops of trees, where protection is needed most.

A method of calculating immediate and future losses caused by the gypsy moth is presented, using examples of pulpwood and sawtimber stands. Discounting of future losses to evaluate their cost in terms of current expenditure is explained. The effect of infestation on forest management is discussed and a format is given for considering control decisions.

A survey of 39 surface-mine sites in southern West Virginia showed that most of the spoils from current mining operations had a pH of 5.0 or higher. Soil-size material averaged 37 percent of the weight of the spoils sampled. A major problem for the establishment of vegetation was a deficiency of nitrogen and phosphorus. This can be corrected with additions of fertilizer at appropriate rates.

Development of a computer simulation model is usually done without fully considering how long the model should run (e.g. computer time) before the results are reliable. However construction of confidence intervals (CI) about critical output parameters from the simulation model makes it possible to determine the point where model results are reliable. If the results are not reliable, due to the variability within the model, the model user at least knows the degree of confidence that may be placed in the results. Such factors as: 1) model variability, 2) prescribed width of the CI, and 3)...

Presents 1971 pulpwood and production and receipt data for the Lake States and Central States. Pulpwood production for the Lake States is given by species for each county, and production by Forest Survey Unit is compared with that of previous years. For the Central States, 1971 pulpwood production and receipt data are presented by State, and four production classes are shown by county.