Baits including 0.1% of ethyl 2‐(4‐((1,4‐dioxaspiro [4.5]dec‐6‐yl) methyl) phenoxy) ethylcarbamate were applied in two buildings containing 46 apartments with various degrees of infestation of the German cockroach, Blattella germanica (L.). During a yearly experiment, generally 8 baits were placed in each apartment and replenished monthly at which time cockroach population density, demographic structure, and percentage of morphologically deformed adults were determined from specimens captured by sticky‐trap sampling. Initial growth of the cockroach population observed during the first two months after deposition of the baits was followed by an asymptotical decrease. Only 2.5% of the initial population remained at the end of the experiment. Although adults with twisted wings (sterile) constituted only 70% of the total adult catches, the decrease of the nymph/adult ratio from 2.9 to 0.7 indicated a far more profound inhibitory effect on cockroach reproduction. This study shows that baits might be an efficient alternative to juvenoid formulations currently in use for control of the German cockroach.
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