Treesearch

Mixed-conifer forests occupy about 6,000 square miles of southwestern Oregon. These forests are characterized by a mixture of Douglas-fir, sugar pine, ponderosa pine, and other species, with Douglas-fir the most abundant. This paper reports the results of a study comparing the site index of Douglas-fir, sugar pine, and ponderosa pine in the South Umpqua drainage above Elk Creek and gives preliminary recommendations concerning choice of species to grow.

This bibliography lists references pertaining to mountain hemlock (Tsuga mertensiana (Bong.) Carr.) found in North American and European literature for individuals interested in this species. The author has attempted to include all references which might conceivably provide useful information on this species; abstracts are provided for those considered most significant. Articles are listed alphabetically by author. A list of common and scientific names of tree species mentioned is found on page 50.

The recent introduction of the European pine shoot moth into this region poses a serious threat to natural pine stands. To combat this threat, quarantines were invoked and eradication programs undertaken. Destruction of infested trees has been used tentatively as an eradication technique. In the meantime, fumigation with methyl bromide was tested over the period of a year to ascertain its usefulness in eradication.

Although most foresters are familiar with the use of aerial photo volume tables, little has been written on how to make them. Certain pitfalls in the construction process have either been ignored or only casually mentioned in the existing literature. The forester tackling his first photo volume table is likely to bypass some of the important considerations without being aware of their existence. This does not prevent the tables from being useful, but it is our belief that better tables will result if the major issues are brought out into the open where they can be faced squarely.

Until very recently, only fragmentary growth information has been available for red alder (Alnus rubra). This gap has now been partially closed through the preparation of normal yield tabled based on temporary sample plot data collected in northwestern Oregon, western Washington, and southern British Columbia.

This bibliography on noble fir (Abies procera Rehd.) includes both North American and European references. Its purpose is to list articles for those interested in the species; the most important references have been abstracted. An article concerning California red fir and one concerning Shasta red fir are included, as their silvical characteristics are similar to noble fir's and these studies were considered especially significant.

This is the second in a series of three reports on experimental fumigation for complete kill of the European pine shoot moth on pines in residential areas and nurseries. It describes the procedures and equipment that were developed and used for the actual fumigation tests described in the other two reports. Tests were made concerning the physical control of gas concentration in the three types and various sizes of portable chambers that were fabricated. Recommendations for the proper use and care of fumigation equipment are made for the use of operators concerned with fumigating infested...

This paper reports actual veneer yields obtained from 10 trees pruned at age 38 and harvested 20 years later. Information of this kind is needed to help determine if and when to prune and ultimately will be essential to a thorough economic analysis of expected returns from pruning.

The aerial photo volume tables in this report are tools to be used in obtaining better timber inventories. Volume estimates based on tables such as these, properly field checked, are generally cheaper than ground cruises of comparable accuracy. Photo volume tables also permit rough volume estimates to be made from aerial photos alone when limited time, bad weather, or inaccessibility precludes field work.

Aerial photo stereograms are valuable for showing neophyte photo interpreters the stereoscopic appearance of common objects and conditions. They are also useful for instruction in measuring heights, horizontal distances, and angles on photos. Collections of stereograms of known conditions are worthwhile reference material for interpretation work in unknown areas.