Abstract
Abstract Injury typical of the phenoxyacetic acid herbicides 2,4-D and 2,4,5-T was observed in a large area of St. Louis in the spring of 1969. Screening of chemicals from a local manufacturer of these herbicides revealed that at least 7 chemicals involved in the production of these herbicides produce symptoms similar to those observed in the field. Injury occurred from aqueous concn as low as 1 ppm as well as from vapors of the isobutyl ester of 2,4-D. The uniqueness of plant injury due to industrial emissions of herbicides demonstrates the need for using biological parameters in assessing air quality.
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