Treesearch

Tests made in New York State in 1956-60 indicate that the portable knapsack mistblower has considerable promise for practical control of the white-pine weevil, now the major insect enemy of white pine in the Northeast. Lindane and malathion, alone and with Aroclor 5460, were the toxicants used in the tests.

In determining the productivity of a certain piece of forest land, it may be desirable to estimate the site index for a certain tree species even though it is not possible to use ordinary measurements of age and height. This situation may arise either because trees of the particular species are not now present in the stand, or because trees of this species that are present in the stand are not suitable for use in determining site index.

The woodlot owners of New England have a large stake in the forestry future of the region. In New England there are more than 250,000 woodlots, averaging about 60 acres each. All together they make up about 15 million acres; and they provide a large part of the raw material needed by local wood-using industries.

For most forest tree species, nutrient requirements have not been investigated beyond general field observations and empirical tests of fertilizers in nurseries and plantations. For Virginia pine (Pinus virginiana Mill.), the first work on nutrition under controlled conditions was a sand-culture study of nitrogen and phosphorus requirements by Fowells and Krauss (1959).

A scale insect, tentatively identified as Xylococculus betulae (Perg.) Morrison, is responsible for one type of bark roughening that is commonly seen on American beech (Fagus grandifolia Ehrh.) trees in certain areas of New England. The insect has also been found on paper birch (Betula papyrifera Marsh.) and yellow birch (B. allegheniensis Britton).

A classified list of more than 300 literature citations dealing with black locust.

Light, essential in the development of a forest, can be controlled within a stand by silvicultural practices. Measuring it, however, has always been a problem for silvicultural researchers. And accurate measurements are necessary, especially in studying the relation between light and reproduction. The desired objective is to measure the total visible light in specific units at a given place and for a given period in the forest stand. Often it is also necessary to compare the amount of light received at many different places in a forest during the same period. The Integrating Light Meter...

White pine blister rust limits the reproduction of white pine in many areas by killing young trees. In other extensive areas unjustified fear of the disease limits white pine planting. An ability to differentiate the sites on which white pine blister rust (caused by Cronartium ribicola Fischer) might be serious from those on which the disease might cause little damage would be of great value. Sites on which rust will not spread seriously could be recommended for the planting of eastern white pine (Pinus strobus L.) without the expense of eradicating nearby ribes bushes. Likewise, funds...

Since white pine is one of the most desirable tree species for the Lake States region, it is unfortunate that fear of the blister rust disease has greatly limited the amount of white pine planted. Research has shown that, in many areas, loss from the disease has not been great even where pine stands have not been protected through ribes eradication. Conversely, in other parts of the Lake States, present control through eradication has not worked as well as is desirable. This paper presents procedures for specialized blister rust control that will permit growing white pine with minimal...

Snow-depth and water-content measurements were made in March and April 1960 in the vicinity of Paul Smiths, New York, to check on procedures developed the previous year for predicting snow accumulation and melt.