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Repeated aerial spraying and burning improved herbicide effectiveness on brush control, aiding reforestation.
In 1955, a study was started to determine the degree of control that might be attained with a program of aerial spraying and burning in the Arctostaphylos patula-Quercus chrysolepis-Ceanothus cordulatus brush type in Siskiyou Mountains of southwestern Oregon. Three brushfields were aerially sprayed with herbicides in 1955, bnrned in 1956, and resprayed in 1958 and 1959. The treatments provided brush control sufficient to allow reforestation. Even resistant species can be controlled or reduced in competitive potential if subjected to repeated treatments. Herbicides were more effective on resprouting shrubs than on well-established and vigorous mature shrubs.
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Gratkowski et al. (1965) studied this question.
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