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DDT: Persistence in Northern Spodosols¹

ABSTRACT

DDT (dichloro-dipenyl-trichloroethene) was used between 1954 and 1967 for the control of spruce budworm (Choristoneura fumiferana) in northern Maine. Soils originally tested in 1967 were resampled in 1973 and 1976 to help clarify the degree of persistence of DDT in northern spodosols. Soils from areas sprayed three times at 1.12 kg/ha continue to contain up to 4.5 ppm DDT residues 12 years after application. Pesticide levels in the soils sampled in 1973 and 1976 were not significantly different from levels measured in 1967. Also, analyses of soil profile samples through the A and B horizons indicated that >96% of the residues were still located in the O1 and O2 horizons.

Key Words: pesticide • insecticide • decomposition

¹ Funding provided by the Maine Agric. Exp. Stn., Univ. of Maine, Orono, ME 04473, and the Environ. Prot. Agency, Project no. EP 00803.

² Associate Professor of Wildlife Resources, Professor of Entomology, and Associate Professor of Chemistry, respectively.

Received for publication February 6, 1977.