Abstract
Survey of insecticide resistance in Blattella germanica was carried out with the insects collected from 16 localities in Kawasaki City, Japan, in the period from September 1966 to August 1967. The configuration ratio of three phenotypes, i. e. SS, RS, RR, was evaluated by the lt-p lines after contact to dieldrin residue. All the populations collected from restaurants, bars, etc. showed high resistance to dieldrin. One population from a pig pen, however, was estimated to be nearly susceptible to dieldrin. As the results of preliminary tests on diazinon resistance, all the populations were proved to be susceptible to the chemical.
