. Chemical control of brush and trees in the lake states : a review of present knowledge. Shrubs Control; Brush Control; Herbicides. Airplane spraying is the newest method of applying foliage sprays, and, although still a relatively poorly known procedure, it has found widespread acceptance because of the large areas that can be treated in a short time and at relatively low cost per acre (66). Even if the original treatment is not highly successful, the costs are so low that a number of airplane applications can be tried be- fore the cost equals that of ground spraying or mechanical opera- tio
. Chemical control of brush and trees in the lake states : a review of present knowledge. Shrubs Control; Brush Control; Herbicides. Airplane spraying is the newest method of applying foliage sprays, and, although still a relatively poorly known procedure, it has found widespread acceptance because of the large areas that can be treated in a short time and at relatively low cost per acre (66). Even if the original treatment is not highly successful, the costs are so low that a number of airplane applications can be tried be- fore the cost equals that of ground spraying or mechanical opera- tions. Aerial spraying also can be used on areas of low accessi- bility where ground methods would be impossible or of prohibitive cost. The hormone-type herbicides are used in aerial spraying. One to two pounds acid equivalent per acre are usually sufficient. This amount is applied at from 2 to 5 gallons per acre, usually in oil or oil- water emulsions and sometimes in water alone (59, 64). Airplane application holds much promise for treatment of brush prior to plant ing, for release of conifers from overtopping trees and brush, and in manipulation of cover for the encouragement of various species of wildlife (6) (fig. 1). Much remains to be discovered about the effects of time of applica- tion and the amount and kind of sprays before a sound basis is reached for aerial spraying. Figure 1.—Red pine plantation re- leased from over- topping hardwoods by aerial spray- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rudolf, Paul O; Watt, Richard F. (Richard Franklin), 1921-; Lake States Forest Experiment Station (Saint Paul, Minn. ). [Minn. ? : Lake States Forest Experiment Station ]
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