Distribution and excretion of juvenoid in the locust Locusta migratoria migratorioides (R. et L.) (Orth., Oedipodinae)

The distribution and the excretion rate of topically administered 3H and 14C‐labelled juvenoids, derivatives of 2‐(4‐hydroxybenzyl)‐1‐cycloalkanone were analyzed in the last instar nymphs and imagoes of the African migratory locust, Locusta migratoria migratorioides. It was found that the main process of elimination of juvenoid is the excretion. About 80% of the total applied label was excreted within the first 2 days after topical application. The maximum quantity of the topically applied juvenoid penetrated in the locust body within the first 2 days after application. However, the administered juvenoid was deposited in cuticle for a long time. It was found that 7–8% of the total applied label was deposited in cuticle (exuvies) that have been casted off after 12 days from application. In the other analysed organs (brain, fat body, thoracic muscles, intestine, gonads, haemolymph) only a small part of the administered radioactivity was found.