Parasitoid wasps from the Aphelinidae family (Hymenoptera) are important control agents of Bemisia tabaci (Gennadius, 1889) cryptic species, both through reproduction and feeding processes. Identifying native parasitoid species within agricultural systems affected by Bemisia whitefly species is the first step to developing guidelines for the creation and release of biological control agents aiming at this highly damaging pest species complex. Taxonomic and phylogenetic analyses based on morphological and molecular characters, respectively, confirmed the occurrence of Encarsia formosa (Gahan, 1924) in greenhouse tomatoes from Santa Maria, Encarsia porteri (Mercet, 1928) in open-field soybean from Santa Maria, and Eretmocerus mundus Mercet, 1931 in greenhouse tomatoes from São José do Hortêncio, all within Rio Grande do Sul state (South Brazil). This is the first report of En. formosa, En. porteri and Er. mundus parasitising B. tabaci in South Brazil, and the first En. porteri partial mtCOI gene sequence being reported and characterised. The high temperature inside the tomato greenhouses can be a possible cause for the predominance of Er. mundus in São José do Hortêncio, and sex ratios in the surveyed populations point to female and male prevalence within Encarsia and Eretmocerus genera, respectively. The combined use of taxonomic and molecular characterisation highlights the importance of combining both morphological and molecular approaches in the assessment of previously unidentified whitefly parasitoids.

来自 Aphelinidae 科（膜翅目）的寄生蜂是烟粉虱（Gennadius，1889）隐匿物种的重要控制剂，无论是通过繁殖还是摄食过程。受农业系统内确定本地蜂种烟粉虱的第一步是开发生物控制剂针对这一严重损害复杂的害虫种类的创建和释放准则。分别基于形态学和分子特征的分类学和系统发育分析证实了Encarsia forosa (Gahan, 1924) 在来自 Santa Maria, Encarsia porteri 的温室番茄中的发生(Mercet, 1928) 在来自 Santa Maria 的露天大豆中，以及Eretmocerus mundus Mercet，在 1931 年在来自 São José do Hortêncio 的温室番茄中，都在南里奥格兰德州（巴西南部）。这是恩的第一份报告。福尔摩沙，恩。波特里和呃。mundus寄生在巴西南部的烟粉虱，以及第一个En。porteri部分 mtCOI 基因序列被报道和表征。番茄温室内的高温可能是Er占优势的一个可能原因。谟在圣若泽-杜奥尔滕休，而在接受调查的人群性别比指向内的女性和男性的患病率丽蚜小蜂和Eretmocerus属，分别。分类学和分子表征的结合使用突出了结合形态学和分子方法在评估以前未识别的粉虱寄生蜂中的重要性。