Treesearch

Exposure of double-diffusion treated and untreated round posts of Hawaii-grown wood showed that (a) untreated 3- to 5-inch posts of 10 species will last from less than a year to 3 years, depending on species, and that (b) except for three species, the treatment did not afford a service life long enough to justify using it.

Written in Fortran IV and MAP, this computer program can handle up to 120 variables, and retain 40 principal components. It can perform simultaneous regression of up to 40 criterion variables upon the varimax rotated factor weight matrix. The columns and rows of all output matrices are labeled by six-character alphanumeric names. Data input can be from punch cards or BCD tape.

Three of the five years from 1959 to 1963 were drought years in the Bogard Ranier District in northeastern California. Precipitation records for 28 years from the Bogard area show that (a) drought conditions were present in one-third of the years; (b) drought occurred in about 54 percent of the falls and springs, 36 percent or the winters, and 50 percent or the summers; and (c) in 42 percent of the years at least two of the three main seasons (fall, winter, spring) were dry.

Santa Ana wind structure varies between the high main ridges, the foothills, and the canyon bottoms. In each of these regions, a typical pattern characterizes the Santa Ana. Strong steady wind, at the high levels are determined almost completely by the large scale weather patterns. lntermediate canyons and ridges are affected by Santa Ana winds only when the foehn is well developed. The low lee side foothills are affected only on the most intense days.

Asphalts and wax emulsions have been recommended as protective coatings to help obtain clean, safe burns in slash disposal work. Fuel value determinations in the laboratory indicate that such coatings add little to the fuel value of slash.

Widespread dieback of Purshia tridentata, on the Inyo National Forest in eastern California in the spring of 1964, was caused by a severe 3-day frost with daily minimums down to 13°F. An unusually warm 9-day period-with temperatures up to 70°F., which preceded the frost by a week, had induced the bitterbrush to break dormancy and start shoot elongation when the frost occurred. Damage to the bitterbrush caused reductions in the current range allotments. This is the first report of so severe a frost injury in this area.

Samples taken May 25, Sept. 2, and Dec. 8, 1964, indicated that leaves were the only fuel components of live chamise with appreciable seasonal moisture fluctuation. A close relationship in fuel moistures existed between like components from the different shrubs sampled. Dead chamise showed little or no variation due to fuel size or season of the year.

Nine years of removal of infections and prevention of seeding of dwarfmistletoe from a young mixed Jeffrey-ponderosa pine stand failed to eliminate the parasite. Spread of the parasite back into the experimental plot from infected trees outside averaged about 0.9 feet per year. One tree in 23 appeared to show some resistance to infection. Jeffrey pine had almost twice as many infections per tree as ponderosa pine.

The sagebrush defoliator was responsible for varying degrees of sagebrush defoliation and mortality over a widespread area in southeastern Oregon, northeastern California, and northwestern Nevada in 1963 and 1964. Severe defoliation sometimes killed sagebrush in a single season. Indications are that the outbreak will continue at least another season. A. websteri has a single annual generation. It is attacked by several species of parasites and predators; the most important of these in California was a Copidosoma.

Photography has long been a useful tool for recording and analyzing environmental conditions. Permanent camera points can be established to help detect ,and analyze changes in the esthetics and ecology of wildland resources. This note describes the usefulness of permanent camera points and outlines procedures for establishing points and recording data.