Treesearch

Trees were rated for their resistance to the foliar pathogens Melampsora medusae and Marssonina brunnea and the foliar and canker pathogen Septoria musiva. Many clones were found to be too susceptible to one or more diseases to be safely planted in the north central United States. The P. X euramericana clones were the most resistant to Septoria.

Operability is the relative ease or difficulty of managing or harvesting timber because of physical conditions in the stand or on the site. Using data collected during standard statewide forest inventories, we developed a method for classifying timber by operability class based on seven operability components.

All 50 states were surveyed to determine the extent of their activities in producing genetically improved trees for timber production. Describes the funds expended, the species being improved, and the use of State and Private Forestry funds provided for genetic improvement. Projects future timber volumes attributable to genetic improvement, and estimates benefit cost ratios.

Biomass yield information by forest type is presented for lesser vegetation in northern Michigan, Wisconsin, and Minnesota based on data from recent field inventories.

Stool spacing of 1 by 1 m and closer maximized hardwood cutting production per unit land area. Stool spacing did not affect diameter or quality of hardwood cuttings.

Fire has been a natural component of the aspen ecosystem. Any fire in an established aspen stand will cause injury. Aspen is easily top-killed, but the roots remain viable. A fire's heat can stimulate sprout growth from these roots, aiding natural regeneration.

Reports on insect suppression in 16 Eastern Region national forests over a 50-year period. Identifies 27 target insects attacked, insecticides used, acreages treated, and results obtained by suppression attempts. Notes that only 3.4% of Eastern national forest land has been chemically treated during the years studied.

A computer program, ATEST, is described in this combination user's guide / programmer's manual. ATEST provides users with an efficient and convenient tool to test the accuracy of predictors. As input ATEST requires observed-predicted data pairs. The output reports the two components of accuracy, bias and precision.

Estimates are developed of primary and secondary wood products production and consumption in the Lake States (Michigan, Wisconsin, and Minnesota) between 1960 and 1980. Consumption estimates are derived through application of the use-factor approach. Increased cooperation among forestry agencies in the three states appears to hold significant regional benefits.

Discusses attempts to model and measure the relationship between research and development activity and the rate and nature of technological change in recent decades. Reviews efforts to model optimal research resource allocation, and presents a model for southern pine forestry research.