ESTABLISHMENT AND SPREAD OF GYRANUSOIDEA-TEBYGI NOYES AND ANAGYRUS-MANGICOLA NOYES (HYMENOPTERA, ENCYRITIDAE), 2 BIOLOGICAL-CONTROL AGENTS RELEASED AGAINST THE MANGO MEALYBUG RASTROCOCCUS-INVADENS WILLIAMS (HOMOPTERA, PSEUDOCOCCIDAE) IN AFRICA

Two specific endophagous parasitoids, Gyranusoidea tebygi and Anagyrus mangicola, of Indian origin, were mass-reared at the International In stitute of Tropical Agriculture in Cotonou and released against the ma ngo mealybug, Rastrococcus invadens, in collaboration with national bi ological control programmes. G. tebygi was released in the following c ountries: Benin, Gabon, Ghana, Nigeria, Sierra Leone and Zaire. In Tog o, it had been released earlier and studied during another project. Th is parasitoid is now established in all areas infested by the mango me alybug. In addition, it established itself without previous release in Congo and Cote d'Ivoire. A. mangicola has been released in Benin, Gab on and Sierra Leone since 1991, and by mid-1993 was recovered from a f ew sites. It seems locally established in southern Benin.