. Chemical control of brush and trees in the lake states : a review of present knowledge. Shrubs Control; Brush Control; Herbicides. Figure 3.—Low- pressure knapsack sprayers may be used to apply basal sprays. Fire equipment can be used for spraying by mounting portable pumps and barrels or tanks on truck beds, provided the rubber on the system is replaced by neoprene, which is not destroyed by the oil in the sprays (72). For covering large areas; airplane application is perhaps the most economical method, although the techniques have not been worked out thoroughly enough to obtain consistent
. Chemical control of brush and trees in the lake states : a review of present knowledge. Shrubs Control; Brush Control; Herbicides. Figure 3.—Low- pressure knapsack sprayers may be used to apply basal sprays. Fire equipment can be used for spraying by mounting portable pumps and barrels or tanks on truck beds, provided the rubber on the system is replaced by neoprene, which is not destroyed by the oil in the sprays (72). For covering large areas; airplane application is perhaps the most economical method, although the techniques have not been worked out thoroughly enough to obtain consistent and effective results with every operation. The volumes applied per acre are quite low—from 2 to as much as 7 or 8 gallons per acre. Good distribution of such small volumes of spray is, of course, very difficult with slow-moving ground equipment. Herbicides used must be effective in small quan- tities because of the comparatively high cost of applying a given quantity of liquid from the air as compared to ground applications. For this reason the hormone-type herbicides, which produce good re- sults when applied at the rate of 1 to 2 pounds acid equivalent per acre, have been used in aerial brush control spraying. Oil or oil- water emulsions have been found most satisfactory. Because of the small size of the spray droplet produced by airplane equipment, the weather conditions for aerial application are criti- cal. Spraying should not be attempted if wind movement is over 6 miles per hour, for then results will be spotty because of drift of the spray. The higher the proportion of oil in the spray, the greater the number of small droplets produced. Light airplanes that can land on small fields or lakes near the point of application and are highly maneuverable are used for most aerial application, although in some instances where helicopters were used the applications cost only about 30 to 50 percent more than with fixed-wing aircraft (20). Helicopters are more maneuver- able a
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