A recently developed biopesticide made of safflower and cottonseed oils has excellent ovicidal activity against the hard‐to‐control spider mite Tetranychus urticae Koch (Acari: Tetranychidae). It has attracted attention as a sustainable treatment for controlling T. urticae because it has low potential for promoting resistance and little effect on the predatory mite Neoseiulus californicus (McGregor) (Acari: Phytoseiidae), which is an important natural enemy of spider mites. Here, we investigated the mechanism of its ovicidal activity against T. urticae. The oil droplets in the oil‐in‐water emulsion of the biopesticide strongly adhered to T. urticae eggs, seeped through the chorion being cut during hatching, and inhibited the embryonic rotational movement necessary for cutting and hatching. No adverse effect was observed on N. californicus eggs even in undiluted biopesticide. We conclude that this biopesticide and N. californicus can be used simultaneously in the integrated management of T. urticae in oily biopesticide‐tolerant plant species.

中文翻译：

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一种植物油基生物农药，对双斑叶螨 Tetranychus urticae Koch 具有杀卵活性

最近开发的一种由红花油和棉籽油制成的生物农药对难以控制的叶螨 Tetranychus urticae Koch（Acari：Tetranychidae）具有出色的杀卵活性。它作为控制荨麻疹的可持续治疗方法引起了人们的关注，因为它促进抗性的潜力较低，并且对捕食性螨类 Neoseiulus californicus (McGregor) (Acari: Phytoseiidae) 的影响很小，这是叶螨的重要天敌。在这里，我们研究了其对荨麻疹的杀卵活性机制。生物杀虫剂水包油乳液中的油滴牢固地粘附在荨麻疹卵上，在孵化过程中通过被切割的绒毛膜渗出，并抑制了切割和孵化所需的胚胎旋转运动。未观察到对 N 的不利影响。californicus 卵即使在未稀释的生物农药中也是如此。我们得出的结论是，这种生物农药和 N. californicus 可以同时用于油性生物农药耐受性植物物种中荨麻疹的综合管理。