Treesearch

This twenty-second annual report shows the Lake States pulpwood harvest decreased to about 4 million cords from a record high of 4 1/2 million cords in 1966. Pulpwood receipts remained high in Wisconsin but decreased in Michigan and Minnesota. Minnesota shipped 106,000 cords more to Wisconsin than in 1966. As a result, only Minnesota's 1967 pulpwood production was higher than the previous year.

Sixty-tree percent of the area in Missouri's National Forests produces forage at the rate of about 50 pounds per acre per year. Forage production on the other 37 percent ranges from a low near 75 pounds per acre in the pine stands to a high of about 200 pounds in the redcedar stands.

A 20-year study in Wisconsin swamp stand of northern white-cedar indicates that after a second thinning gross basal area growth is independent of stand densities ranging from 90 to 225 square feet of basal area per acre. Mortality, net growth, and ingrowth were also independent of density in the thinned plots.

Presents a shortcut method of predicting sugar maple tree yields by saw log grade from d.b.h. and butt log grade.

A computer program has been written in Fortran IV to calculate probability distributions of present worths of investments in timber production. Inputs can include both point and probabilistic estimates of future costs, prices, and yields. Distributions of rates of return can also be constructed.

Describes field techniques by which winter deer-browse production can be sampled with reasonable accuracy and moderate effort; and expedites the tabulation of the browse data. The method will be useful to both land managers and scientists doing research on the habitat of the white-tailed deer.

Pulpwood production in the Northeast continued to climb in 1966 for the fourth consecutive year. Total production of all forms of pulpwood (table 1)-roundwood, pulpwood chips, and miscellaneous wood-industry byproducts-amounted to 5,737,700 cords in the 14 Northeastern States. This total represents a gain of 604,900 cords or 12 percent over the 1965 total of 5,122,800 cords. Since 1963, when this annual survey of pulpwood production in the Northeast was begun, total pulpwood production in the 14 states has risen by 1,158,700 cords or nearly 25 percent.

Michigan's timber volumes increased about two-fifths since 1955 reaching 15.0 billion cubic feet of growing stock including 33.7 billion board feet of sawtimber-size material in 1966

The elytral stridulitra and the plectra on the sixth abdominal tergite are described and illustrated for both sexes of Conotrachelus naso LeConte, C. posticatus Boheman, and C. carinifer Casey, as is the stridulitrum of the male C. nenuphar (Herbst); the female of C. nenuphar has no plecctrum. The stridulations are described and illustrated by audiospectrographs for the first 3 species. Demonstrable differences exist between the stridulations of these species, and between the sexes of each. Individual weevils are capable of several speeds and frequencies of stridulations. Sound production...

A life history study was made of the ash seed weevils, Thysanocnemis bischoffi Blatchley and T. helvola LeConte. Over-wintering occurs as larvae in ash seeds or in soil, with adults appearing in July and August. Adults soon deposit eggs within ash seeds, where larval development occurs. Only one generation per year was observed for each species.