Effective dose present in cockroach larvae exposed continuously to a juvenile hormone active insect growth regulator

Summary Larvae of the German cockroach exposed to filter paper impregnated with juvenile hormone (JH) active substance contain, at the middle of the last instar, about one-hundredth of the dose applied to 1 cm². The amount of metabolized substance rises sharply before and disappears rapidly after the ecdysis into the supernumerary instar.Acknowledgments. We wish to express our thanks to Prof. Dr H.A. Schneiderman, Dr W. Vogel and Dr P.A. Vonder Mühll for stimulating discussion and to Mr M. Gruber for correction of the text.