Abstract
In laboratory tests with males of 3 species of cockroaches infesting buildings at U.S. Army and Air Force installations in Germany and France during the period 1956-59, observations indicated that Blattella germanica in several widely separated areas were resistant to DDT and chlordane but not to mala-thion. Nymphs of Blatta orientalis from 2 areas of Germany were resistant to DDT and those from 1 area to chlordane but none to malathion. None of the specimens of Supella supellectilium tested from 3 areas of Germany showed resistance to either DDT, chordane or mala-thion.

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