Treesearch

Probit analysis was used to estimate relationships between the probability that forest land was used for recreation and characteristics of the forest, owner, and surrounding community. Land held by owners with more formal education or those reared in large cities was more likely to be used for recreation while the opposite was true for land held by older owners. Correlations are drawn with other studies and policy implications are discussed briefly.

The total industrial harvest in West Virginia was over 110 million cubic feet in 1987. This was a 24 percent increase since 1979. Sawlogs accounted for 70 percent of the total and pulpwood accounted for 21 percent. During this 8-year period, sawlog production was up by 35 percent to 563 million board feet. Pulpwood production reached 272,000 cords of roundwood and 286,000 cord equivalents of residue chips. The use of manufacturing residues produced at West Virginia mills increased from 75 percent to 90 percent. The largest use of residues was for fiber.

A statistical report on the third forest survey of New Jersey (1987). Findings are displayed in 66 tables containing estimates of forest area, numbers of trees, timber volume, tree biomass, and timber products output. Data are presented at two levels: state and county.

A statistical report on the fourth forest survey of Maryland (1986). Findings are displayed in 97 tables containing estimates of forest area, tree biomass, and timber volume. Data are presented by state and county level.

A statistical report on the fourth forest survey of West Virginia (1989). Findings are displayed in 119 tables containing estimates of forest area, number of trees, timber volume, tree biomass, and timber products output. Data are presented at three levels: state, geographic unit, and county.

Early suppression .of increasing spruce budworm populations is essential to prevent epidemics; however, early changes in budworm numbers are difficult to detect. An effective and inexpensive method to detect early increases is needed. Red-breasted nuthatches eat more spruce budworm larvae and pupae as the insect increases in number. We estimated the number of large larvae in Maine and northern New Hampshire forest stands in 1982 and 1983 by determining the number of these larvae in the birds' stomachs. When the mean number of spruce budworm in the stomach approached 1.7, budworm populations...

A standardized laboratory bioassay was used to quantify the lethal and sub-lethal responses of larval and adult cottonwood leaf beetles, Chrysomela scripta F., to Bacillus thuringiensis var. san diego, formulated as M-One standard powder (Mycogen Corporation, San Diego). The median lethal concentration (LC50) for second instars, after a 96-h exposure to B. thuringiensis var. san diego, was 21,000 Colorado potato beetle international units per milliliter water. The LC50 estimates for the third instars and adults were 20 and 40 times higher than for second instars, respectively. Larval LC,...

A statistical report on the fourth forest survey of Kentucky (1988). Findings are displayed in 204 tables containing estimates of forest area, number of trees, timber volume, tree biomass, and timber products output. Data are presented at three levels: state, geographic unit, and county.