The red palm mite, Raoiella indica Hirst (Acari: Tenuipalpidae), is a severe pest of coconut (Cocos nucifera L.), banana (Musa sp.), and some ornamental palms. The predatory mite Amblyseius largoensis Muma (Acari: Phytoseiidae) has been reported in association with R. indica in several countries. Here, we assessed the interaction effect between prey density and population structure on predation and fecundity of this phytoseiid species. Specifically, we estimated the predation capacity of nymphs and females of A. largoensis based on their functional and numerical responses when fed on eggs, immature stages (deutonymphs or protonymphs), and females of R. indica. Nymphs and females of A. largoensis presented type II functional responses to R. indica, except for nymphs of the predator when consuming immature stages of the pest that exhibited a type III functional response. Nymphs and females of the predator showed a higher attack rate and shorter handling time when feeding on eggs of R. indica than on immatures and females. The highest oviposition rates of A. largoensis were observed when eggs and immatures of the pest were offered as prey. The results indicate that nymphs and females of A. largoensis may be effective in suppressing R. indica populations, mainly at lower prey densities.

红棕榈螨Raoiella indica Hirst（Acari：Tenuipalpidae）是椰子（Cocos nucifera L.），香蕉（Musa sp。）和一些观赏性棕榈的严重害虫。据报道，在一些国家中，捕食性螨类拉姆比乌斯毛uma（Acari：Phytoseiidae）与印度R（R。indica）有关。在这里，我们评估了猎物密度和种群结构之间的相互作用对这种植物杀螨物种的捕食和繁殖力的影响。具体而言，我们估计若虫和雌性的捕食容量A. largoensis根据它们的功能和数值响应于鸡蛋，未成熟阶段（deutonymphs或protonymphs）进料时，和雌性R.籼稻。largoensis的若虫和雌虫对印度R具有II型功能性反应，但当捕食表现出III型功能性害虫的未成熟阶段时，捕食者的若虫除外。捕食印度R鱼卵时，捕食者的若虫和雌性显示出比未成熟和雌性更高的攻击率和更短的处理时间。当提供害虫的卵和未成熟物作为猎物时，观察到了最高的落叶松产卵率。结果表明，L。largoensis的若虫和雌性可能有效抑制印度R种群，主要是在较低的猎物密度下。