[Influence of reduced pterine and juvenile hormone on the pigmentation of the phasms Carausius morosus (author's transl)].

Tetrahydrofolic acid and dimethyltetrahydropterine, FH4 and DMH4P, have an antagonist action. FH4 darkens the phasms. DMH4P and the tryptophane have an inhibitrice influence on the melanisation, probably by the increase of the synthesis or the release of serotonin, in the hypoderm. For the adult phasm remaining ivory, xanthopterin must be added in the treatment. The addition of diapausing chrysalids pieridae extract (containing juvenile hormone JH) and treated by FH4, in the treatment precedent, transmits the pgimentary effect at the first generation, which presents a strong percentage of dark or ivory phasms.