Treesearch

The nature and scope of law-enforcement problems in the National Park System are of increasing concern to park and recreation area managers. A positive response by management in terms of formulating and executing a fully professional and effective enforcement program is vital for sustaining public confidence that Parks are safe for individual and family use. Law enforcement must be carried out in perspective with other management programs and developed with sensitivity to the changing nature of society and the changing needs and interests of park users.

A 3-year study indicates that nuisance behaviors, law violations, vandalism, and littering in forest campgrounds are more extensive than is generally believed. All campers share responsibility for the problems. Violations occur because of ignorance of, lack of understanding, or a willingness to disregard rules. Control measures are discussed, including an incentive system utilizing monetary and nonmonetary rewards, which was used successfully to control littering in a large forest campground.

A brief history of the importance of oak in Europe, contrasting the methods used in France and Britain to propagate the species and manage the forests for continued productivity. The significance of oak as a strategic resource during the sailing-ship era is stressed, and mention is made of the early development of oak management in North America. The international trade in oak logs and lumber is also discussed.

Reports the results of a survey of operational prescribed burns in the Lake States during 1970.

The viability of seeds o[ northern conifers apparently does not persist in the forest floor for more than one year. A set of forest-floor samples collected two years alter a heavy seed crop and one year alter a seedcrop failure did not produce any conifer germinants, regardless of whether or not the surfaces of the samples were disturbed. A second set of forest-floor samples collected the spring alter a good conifer seed crop yielded many conifer germinants. Forest managers should not rely on seed in the forest floor for natural regeneration of northern conifers.

Most of the sugarbushes being tapped today developed from natural forest stands years before their present owners were born. Trees were plentiful then, and land could be purchased at low cost. Wood was the primary fuel for both homes and sugaring operations, and unwanted trees in the sugarbush were removed as part of the annual wood-cutting process. The development of sugarbushes from natural stands was a "hit or miss" proposition.

The chemical constituents of honey locust, Gleditsia triacanthos L., leaves were investigated as feeding stimulants for larvae of Homodaula anisocentra Meyrick. A water-soluble fraction evoked a significant feeding response. Several sugars and amino acids were present in this extract, but only sucrose and fructose stimulated feeding significantly; several amino acids stimulated feed-ing to a lesser degree. The presence of other active watersoluble constituents is probable, but none was isolated during this study. A chloroform-soluble fraction from the leaves apparently synergized the...

This paper contains partial results of a cooperative study made jointly by the Universities of Maine, Massachusetts, and New Hampshire, and the Northeastern Forest Experiment Station of the USDA Forest Service.

Pokeweed, a plant abundant in Appalachia, exhibits some chemical similarities to a related species that has shown molluscicidal properties. Because this suggests that pokeweed, Phytolacca americana L. (P. decandra L.), has potential for controlling fresh-water snails, we have compiled this report of its chenlical composition, uses, propagation methods, and other potentially useful species of the genus Phytolacca.

A research program is being carried on to develop methods for germinating and cultivating Lobelia inflata L., a native forest plant that is the principal source of the alkaloid lobeline, which is used in an increasing number of anti-smoking preparations. The goal is to produce maximum lobeline yields.