Some phytophagous arthropods species acquire full potential to reach pest status, thus knowledge of control strategies is crucial. The use of biological agents is a promising tactic and, in this sense, it is key to identify the natural enemies that can act to control the phytophagous species. Selenothrips rubrocinctus is a thrips species recently found associated with roses (Rosa spp.) The objective of this work is to study the predatory capacity, the functional response and both search and handling times of Chrysoperla externa under S. rubrocinctus associated with roses. The bioassays were carried out for the 1st, 2nd and 3rd instars of C. externa, offering nymphs of S. rubrocinctus, under controlled conditions of laboratory. Chrysoperla externa larvae have great predatory capacity on S. rubrocinctus nymphs. Third instar larvae consumed a greater number of prey and had both shorter search and handling time. Their ability and voracity to control the pest was shown. The type II functional response confirmed that C. externa consumption rate was directly related to prey density, and a higher consumption rate whenever available at higher densities was verified.

一些植食性节肢动物物种具有达到害虫状态的全部潜力，因此控制策略的知识至关重要。使用生物制剂是一种很有前途的策略，从这个意义上说，识别可以控制植食性物种的天敌是关键。Selenothrips rubrocinctus是最近发现的与玫瑰相关的蓟马 ( Rosa spp.)。这项工作的目的是研究与玫瑰相关的S. rubrocinctus下的Chrysoperla externa的捕食能力、功能反应以及搜索和处理时间。在实验室受控条件下，对C. externa的 1、2 和 3 龄进行了生物测定，提供了S. rubrocinctus的若虫。外金蝽幼虫对红蝽若虫具有很强的捕食能力。三龄幼虫消耗的猎物数量较多，搜索和处理时间也较短。他们控制害虫的能力和贪婪得到了体现。II 型功能反应证实，C. externa 的消耗率与猎物密度直接相关，并且验证了在较高密度下可获得较高的消耗率。