Insecticide residues in organic soils of six vegetable growing areas in Southwestern Ontario, 1976

Abstract

Organic soils on 28 farms located in six widely separated vegetable growing areas in southwestern Ontario were sampled in 197 6 and analyzed for insecticide residues. Soil organic content generally was >65%. Organochlorine insecticide residues were detected in soil on all farms. Total DDT ranged from organophosphorus>cyclodiene>carbamate insecticide residues. Area averages of total insecticide concentration (ppm) in the six marshes were: Colbar 30.2, Holland 22.5, Keswick 12.7, Erieau 9.5, Leamington 9.1, and Thedford 7.7.