Treesearch

Intensive forest management requires knowledge about the differences in productivity of land areas or sites. The suitability of management systems and stand treatments often depends on the potential of the particular site in question. For example, conversion of low-value stands to another species may be economically feasible on the best sites, but not on the poor ones. To provide the guides needed for management decisions, sites must be grouped into quality classes on the basis of studies that relate site productivity to measurable site characteristics. Local studies are usually required,...

The purpose of this note is to give a brief pictorial description of the internal defects in paper birch (Betula papyrifera Marsh.) and yellow birch (B. alleghaniensis Britt.) that are associated with external signs of infestation by the ambrosia beetle Xyloterinus politus (fig. 1). The information was gained during studies of trees growing in the White Mountains of New Hampshire.

A preliminary study of the bacteria associated with living and dead larvae of the gypsy moth (Porthetria dispar (L.)) was undertaken to determine what types of micro-organisms may be associated with disease in this insect. Specific objectives of this study were to enumerate the types of aerobic bacteria, and if possible to further elucidate the role of disease causing micro-organisms in the population dynamics of this insect (Campbell 1963). In addition, information was taken to determine if there was a gross relationship between the habitat of the insect and the microflora encountered.

In 1964 the Maine Forest Service, in cooperation with the Northeastern Forest Experiment Station, conducted intensive investigations of a systematically selected sample of the fires that occurred in the State that year. The immediate purpose was to determine precisely how the fires started and who or what started them, and to assemble relevant information about the people and circumstances involved. The basic objective of any such work is, of course, to reduce forest fires. The information gleaned from these investigations was expected to provide helpful guides for making the State's...

Open-pit or strip-mining - primarily for coal - has expanded rapidly in eastern Kentucky during the past 15 years. Information about the amount, location, and general characteristics of the disturbed areas is necessary for appraising the economic impacts and overall effects of strip-mining in that section of the state, for planning reclamation programs, and for determining research needs and priorities. To obtain reliable estimates of the acreage disturbed both by the mining itself and by the associated coal-haul roads, and to provide relevant information about the disturbed areas, a...

Epicormic branches and associated defects are leading causes of degrade and value loss in lumber sawed from hardwood logs. The degrade may be in the form of small knots, ingrown bark, wood blemishes, and/or rot.

In recent years a great deal of interest has been focused on tree growth as measured with relatively precise instruments over short periods of time. These growth measurements are usually made with vernier-band dendrometers similar to those described by Hall (1944) and Liming (1957), or dial-gage dendrometers similar to those described by Reineke (1932) and Daubenmire (1945).

Because the woodpulp industry is one of the mainstays of the forest economy of the Northeastern States, the U. S. Forest Service's Northeastern Forest Experiment Station has begun an annual survey of pulpwood production in the region. This is a report on the survey completed in 1963. The main purposes of these surveys are: (1) To determine the current magnitude of the pulpwood market. The survey will help pulpwood producers and pulpmill wood-procurement staffs to identify areas that are capable of producing large volumes of pulpwood. (2) To provide year-by-year data that can be used in...