Abstract
THE protracted persistence of DDT and some other organochlorine insecticides in soils is well documented1,2. While it has also been shown that these persistent residues can contaminate a resident fauna3, there has been little indication of the duration of this relationship once treatment ceases, except for observations covering a year or two4,5. We now present data of pesticide residues from small mammals covering a period of 9 years after single applications of DDT applied to forests at a rate of 0.89 kg/hectare (1 pound/acre). These treatments were for control of the spruce budworm, Choristoneura fumiferana (Clem.), in northern Maine, United States.
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