Treesearch

The bark beetle predator Thanasimus undatulus Say was captured in statistically significant numbers (total catch = 470, 713, and 137) in three field experiments using multiple-funnel traps baited with various combinations of pheromones for the spruce beetle, Dendroctonus rufipennis Kirby, and the secondary bark beetles Dryocoetes affaber Mannerheim, and lps tridens Mannerheim. Thanasimus undatulus was attracted to frontalin and -pinene, the commercial spruce beetle lure, alone or combined with the D. affaber pheromones (+)-endo- and (+_)-exo-brevicomio. Ips tridens pheromones,(+)- and...

Initial stem diameter of bareroot red oak planting stock was a better morphological indicator of future height and diameter growth in a shelterwood underplanting than were initial shoot length and number of first-order lateral roots. Stem diameter near the root collar provides an integrated measure of the growth potential of red oak planting stock because of its strong relationship with shoot and root characteristics associated with field performance. Ease of measuremeht and the significant, positive correlation of stem diameter with root system size, also make diameter an operationally...

Ecological processes near habitat edges often differ from processes away from edges. Yet, the generality of "edge effects" has been hotly debated because results vary tremendously. To understand the factors responsible for this variation, we described nest predation and cowbird distribution patterns in forest edge and forest core habitats on 36 randomly selected plots in three states in the midwestern United States. We tested four hypotheses that may explain the variation and mechanisms responsible for edge effects among the 36 plots: (1) the landscape context, (2) the local predator...

Tomicus piniperda, the pine shoot beetle, is an exotic insect that was first found in North America in 1992. A federal quarantine currently restricts movement of pine products, including Christmas trees, from infested to uninfested counties. We conducted a study to determine if T. piniperda would reproduce in Christmas trees that were cut and taken indoors during the Christmas season. Twelve Scotch pine, Pinus sylvestris, Christmas trees in- fesed with overwintering T. piniperda beetles were cut in Indiana in early December 1993 and taken to Michigan. Four trees were dissected immediately,...

A wide variety of organisms are unintentionally transported from country to country each year, primarily as a result of world trade. Practically all classes of plants and animals can be stowaways. Aquatic organisms travel in the ballast water of ships; land organisms move with the cargo. Some organisms hitch rides inside the cargo, while others travel on or inside the crating, pallets, or other shipping materials.

The inventory of the forest resources of the Ottawa National Forest reports 967.0 thousand acres of land, of which 908.6 thousand acres are forested. This bulletin presents an analysis of forest resources focusing on change in tree species composition, timber volume, growth, removals, and mortality.

Industrial roundwood production rose from 346.8 million cubic feet in 1992 to 386.9 million cubic feet in 1994. Pulpwood accounted for 62% of total roundwood production in Michigan in 1994--3.0 million cords. Saw-log production rose from 632 million board feet in 1992 to 658 million board feet in 1994. Logging residue generated in 1994 was estimated to be 4.8 million cubic feet.

Discusses recent Missouri forest industry trends; production and receipts of industrial roundwood; and production of saw logs, veneer logs, cooperage bolts, charcoal, and other products in 1994. Compares findings with those from earlier surveys. Reports on the quantity, type, and disposition of wood and bark residues generated by the primary wood-using industry.

Industrial roundwood production rose from 357 million cubic feet in 1992 to 378 million cubic feet in 1994. Pulpwood accounted for 65% of total roundwood production in Wisconsin--3.1million cords in 1994. Aspen constituted 37% of the roundwood cut for pulpwood. Saw-log production rose from 588 million board feet in 1992 to 645 million board feet in 1994. Principal saw-log species were red oak, aspen, hard maple, white oak, and red pine. Logging residue generated in 1994 was estimated to be 157 million cubic feet. Ninety-eight percent or more of each residue class (coarse, fine, bark)...

Reports findings on the latest survey of residential fuelwood consumption and production in Indiana. Topics examined include the geographic distribution of residential fuelwood consumption and production within the state; the species of trees used for residential fuelwood; the types of wood-burning facilities used; the reasons for burning fuelwood; and the land, ownership, and tree classes from which fuelwood was produced.