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Fates of the two isomers of endosulfan and three related compounds were investigated under controlled and semicontrolled conditions. Bean plants, sugar beet plants, and glass plates were used as substrates and the rate of dissipation from each surface was measured. Loss rates of isomers I and II and the ether were consistent in both environments and apparently substrate-dependent: glass > sugar beets > beans. In the controlled environment losses from glass and plant surfaces were: ether > isomer I > isomer II > sulfate > diol. In the greenhouse, under semicontrolled conditions, the sequence of loss from plant surfaces was: isomer I > ether > isomer II > diol > sulfate.

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