Treesearch

Includes detailed information on all common defects that may aRect hardwood trees and logs. Relationships between manufactured products and those forms of round material to be processed from the tree for conversion into marketable products are discussed. This handbook supersedes Agriculture Handbook No. 244, Grade defects in hardwood timber and logs, by C.R. Lockard, J.A. Putnam, and R.D. Carpenter, 1963.

An artificial diet was developed for labortory rearing of the cottonwood leaf beetle, Chrysomela scripta F., and the imported willow leaf beetle, Plagiodera versicolira (Laicharting). To reduce microbial contamination of the media, procedures were developed for the separating egg masses and sterilizing egg surfaces. Cottonwood leaf beetle larvae reared from neonate to adult on this artificial diet had greater mortality, took longer to develop, and were smaller than larvae reared on fresh poplar foliage. Adult longeviety was similar for both diet-and foliage-reared larave. Survival and...

Female eastern spruce budworm, Choristoneura fumiferana (Clemens), inoculated sublethally as fourth or fifth instars with Nosema fumiferanae (Thomson), exhibited significant reductions in size, fecundity, and total egg complement. Mating success and egg fertility were similar for treated and control insects. The presence of disease improved the positive correlation between fecundity or total egg complement and female pupal weight without significantly reducing the slope. Toyal egg complement was negatively correlated with disease load. A subsample of progeny reared from each fertile mating...

Diease in spruce budworm, Choristoneura fumiferana (Clemens), caused by the microsporidian Nosema fumiferanae (Thomson), increase larval susceptibility to mortality by bacillus thuringlensis (Berliner) treatments compared with larvae free of N. fumiferanae disease. The median lethal concentration (LC50) of B. thuringiensis as determined by the diet incorporation bioassy method, was significantly lower for larvae infected transoverially with N. fumiferanae, but the similar slope obtained for intitially healthy larvae indicated an independent and additive interaction. The median lethal time...

Lake States pulpwood production climbed to a record 8.14 million cords, Michigan produced 2.92 million cords, and Minnesota produced 2.13 million

A coppice and a first-rotatioin stand of hybrid poplar barely differed in biomass yields beyond age 4. Repeated harvesting of coppice stands under short rotation reduced yields.

Discusses 1987 production and receipts and recent production for other years in the Lake and Central States. Shows Michigan, Minnesota, and Wisconsin production by species for each county and compares production by Forest Survey Unit with that of previous years. Presents 1987 production and receipt data for Illinois, Indiana, Iowa, and Missouri, and shows four production classes by county.

Describes the location and physical setting of the 171 plots that were remeasured and sampled for a study of the relation between various aspects of forest conditions and atmospheric position across the northwestern Minnesota to southeastern Michigan acidic deposition gradient.