Aedes albopictus mosquitoes coated with a powder made of a mixture of pyriproxyfen and a fluorescent dye to preserve the possibility of distinguishing between released boosted sterile males and wild males in field surveys. (a) Boosted sterile male just after impregnation; (b) the same, 3 h later; (c) female after mating with this male: pyriproxyfen powder transferred from boosted sterile male to female during mating can be seen on its genitalia. Photo credit: L. Laroche, UMR Mivegec, Montpellier.