Treesearch

This report presents the results of a survey of the forests of Iowa, a part of the national survey of forest resources. The purposes of this survey are: 1. To make a field inventory of the present supply of standing timber. 2. To find out how fast this supply is being increased through growth. 3. To find out how much it is being diminished through industrial and domestic uses, fire, insects, disease, and other factors. 4. To determine the present consumption of forest products. 5. To interpret and correlate these findings to aid in the formulation of private and public forest policies....

Little is known about the effects of thinning upon hardwoods in southern New Jersey. To supply some of this needed information, State foresters have established several thinning studies. This research note reports the results of two of these studies, both located in stands of the pin oak-sweetgum type. One study was in Salem County, the other in Cumberland County.

What kind of natural regeneration follows cutting in the bottomland hardwoods of southern New Jersey?

Removing bark from standing trees with sodium arsenite is an inexpensive but efficient way to produce peeled pulpwood. About 200,000 cords, principally hardwoods, are produced annually by chemi-peeling, a technique that is fast replacing old-fashioned sap-peeling as a means of debarking in the woods.

Forest tree seed crops in 1958 were considerably better than those in 1957, according to observers. However, heavy and medium seed crops of some species were spotty in occurrence. Late spring frosts were probably responsible for poor or failing crops of some species in Vermont, New Hampshire, and northwestern Connecticut. Cone weevils were reported damaging the white pine crop in southwestern Maine, southern New Hampshire, and central and northwestern Massachusetts. Insects also damaged seed of white spruce in northern Maine, balsam fir in south-central Maine, and hemlock locally in...

The damage that deer can do to both planted and natural tree seedlings is vividly demonstrated by a l/l0-acre fenced exclosure at Hickory Run State Park in Carbon County, Pennsylvania. Here, by comparing the growth of trees that have been browsed by deer with the growth of trees that have been protected from deer by the fence, one can see the injurious effects of browsing strikingly revealed.

Three scales of aerial photography were tested in an attempt to determine the best scale to use in forest surveying. This was done by comparing photo measurements of average tree height, average crown diameter, and crown-closure percent. These stand variables were selected for testing because of their applicability in making aerial estimates of timber volume.

Aerial photographs are used widely in forest inventories. But there is a continuing need for improving the techniques of photo interpretation and making more efficient use of photographs. When the number or intensity of sample ground plots is controlled by airphoto classifications, a reliable stratification of the timber area is a must.

Melampsora leaf rust occurs in all countries where poplars are native or where they have been introduced for ornamental use or timber culture. The rust is easily recognized by the bright orange-yellow spore masses on the undersides of the leaves during most of the growing season.

In nursery seedbeds, severe root competition soon develops among seedlings of yellow birch (Betula alleghaniensis). This is due to the characteristic root system of the species - wide-spreading lateral growth with little downward penetration (fig. 1).