Abstract
Evaluation of occupational and general public exposure to Bacillus thuringiensis (Bt) during application of this microbial agent for control of the gypsy moth was requested by the Oregon State Department of Human Resources, Health Division, located in Portland. Bt was applied by helicopter on about 250,000 acres of forest, rural, and urban areas in 1985 and 1986. Project operational plans, accident prevention, safety plans, personal protective-equipment usage, and work practices were reviewed and evaluated. Personal exposure and area air monitoring for Bt was carried out during application. Air sampling indicated there was a widespread exposure potential. The author recommends that care be taken by those employees handling Bt in solution and that splashing of Bt to the eye be avoided due to possible corneal ulcer development. The dispersing-agent Plyac is recommended for use in handling the waste-disposal problem. Access to the mixing and application areas should be restricted.
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