Ref ID : 2167
G.P. Cobb, E.H. Hol, P.W. Allen, J.A. Gagne, and R.J. Kendall; Uptake, Metabolism and Toxicity of Terbufos in the Earthworm (Lumbricus terrestris) exposed to Counter-15G in artificial Soils. Environmental Toxicology & Chemistry 14(2):279-285, 1995
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Earthworms (Lumbricus terrestris) were exposed to COUNTER-15G in artificial soils for 32 days in four treatment blocks. Simulated rainfall and temperatures were used to approximate conditions during planting time in the U.S. corn belt. Maximum mean uptake of terbufos was noted on the 8th day following pesticide treatment. Terbufos sulfoxide uptake by earthworms was higher than terbufos uptake, and concentration maximum was observed on day-16 post-application. Maximum concentrations of terbufos sulfone were detected in earthworm tissues on day-32 post-application. No significant earthworm mortality was observed on any single collection date, but temporal differences in mortalities were noted between control and treatment groups Total concentrations of terbufos and oxidative metabolites in L. terrestris substantiate existing residue data from field investigations.