The Indian Ocean includes several Islands and Archipelagos and a survey of the fauna of Phytoseiidae was realized recently in these poorly known territories, despite La Réunion Island is located in an area being a hotspot of biodiversity. The Phytoseiidae fauna of La Réunion Island has been poorly investigated so far with only 33-recorded species including 24 Amblyseiinae, 5 Phytoseiinae and 4 Typhlodrominae, among which 8 species that had been described as new. All data concerning La Réunion have been published in nine papers until now. New results of surveys done recently (2015-2018) are presented in this tenth paper and add 19 newly recorded species among which 3 are new to Science and 21 already known species but with additional data. Among these 19 species, at least nine are already well known as biological control agents (BCA). Demonstration of the natural occurrence of already known efficient BCA in these territories is consequently of great agricultural and commercial interests, in addition of the contribution to fundamental knowledge of biodiversity of these poorly known territories.

Vietnam is a large country of Southeast Asia and a globally recognized hotspot of biodiversity. Until recently, only limited surveys had been carried out on the resident Phytoseiidae fauna and presence of 12 species had been documented, with 11 belonging to the sub-family Amblyseiinae and 1 to the sub-family Typhlodrominae. Here, we present results from 2017 field surveys and add a total of 8 new country records, one of which a newly-described species. At least 5 species (i.e., Neoseiulus longispinosus, Paraphytoseius cracentis, P. orientalis, Amblyseius cinctus and A. herbicolus) are well-known biological control agents (BCA), while two species (Euseius ovaloides and Gynaeseius liturivorus) carries ample potential as BCA agents but necessitates further study. In addition to the intrinsic value of phytoseiid mite biodiversity in tropical environments, demonstration of the natural occurrence of efficient BCAs in Southeast Asian countries such as Vietnam is of great agricultural and commercial interest.