Biological Assessment of Aerial Forest Spraying Against Spruce Budworm in New Brunswick: III. Effects on Two Overwintering Parasites

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Abstract
Studies of the effects of widespread DDT spraying on the parasite complex of the spruce budworm constitute part of a comprehensive program of biological assessment of the New Brunswick forest spraying operations that began in 1952. In the years 1952-1958 these operations covered over 9,000 square miles, practically all the forested area of the northern part of the Province. Almost all areas have been treated two or more times; approximately 80 square miles of the original outbreak area has been sprayed five times, and an experimental plot has been sprayed in each of the seven pears. This has involved the use of over 7,000,000 pounda of DDT, applied mostly at the rate of one-half pound per acre in one-half U.S. gallon of oil solvent.