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Toxicities of acetogenin-based bioacaricides against two-spotted spider mite and selectivity to its phytoseiid predators.
Experimental and Applied Acarology ( IF 2.2 ) Pub Date : 2020-05-18 , DOI: 10.1007/s10493-020-00501-6
J Miotto 1 , A F Duarte 1 , D Bernardi 1 , L P Ribeiro 2 , F Andreazza 3 , U S Cunha 1
Affiliation  

Tetranychus urticae is the main pest of strawberry crops and can cause up to 80% of productivity losses under high infestations. Aiming to search T. urticae management alternatives compatible with eco-friendly or organic-based food production systems, this study evaluated the lethal and sublethal toxicities of formulated derivatives from Annonaceae (rich in acetogenins) against this pest species. In addition, it also evaluated the selectivity of the most promising formulation to the predatory mites Neoseiulus californicus and Phytoseiulus macropilis, which are largely applied in biological control in Brazil. Among the derivatives tested, the emulsion from the ethanolic seed extract of Annona mucosa—ESEAm (major component: acetogenin bis-tetrahydrofuran rolliniastatin-1) caused pronounced mortality of T. urticae after 120 h of exposure (LC50 = 465.5 mg L−1), in a comparable or superior manner to an abamectin-based synthetic acaricide used as positive control (LC50 = 1243.4 mg L−1). Moreover, ESEAm exposure resulted in a significant decrease in the number of eggs laid by females and caused the most pronounced ovicidal action for T. urticae, with only 5% embryonic viability. However, ESEAm also showed high toxicity to the predatory mites tested, causing 100% mortality for both species after 120 h exposure, similar to abamectin. The interaction between these bioacaricides and biological control agents should be tested under field conditions to further assess the potential ecological selectivity of these derivatives.

中文翻译:

产乙酸甘油酯的生物杀螨剂对二斑叶螨的毒性及其对植物杀螨剂的选择性。

斑节对虾是草莓作物的主要害虫,在大量侵染下会造成高达80%的生产力损失。为了寻找与生态友好型或有机食品生产系统兼容的锥虫管理替代品,本研究评估了来自番荔枝科(富含乙酸原素)的配方衍生物对该害虫的致死和亚致死毒性。此外,它还评估了最有前途的制剂对捕食性螨新小食虫大型捕食性螨的选择性,这些捕食性螨广泛用于巴西的生物防治在测试的衍生物中,番荔枝番荔枝乙醇种子提取物的乳液-ESEAm(主要成分:产原素双-四氢呋喃rolliniastatin-1)在暴露120小时(LC 50  = 465.5 mg L -1)后,以与基于阿维菌素的合成杀螨剂相当或更好的方式引起明显的荨麻疹死亡用作阳性对照(LC 50  = 1243.4 mg L -1)。此外,ESEAm暴露导致雌性产卵的数量显着减少,并引起荨麻疹最明显的杀卵作用,只有5%的胚胎存活率。然而,ESEAm对被测掠食性螨也显示出高毒性,与阿维菌素相似,暴露120 h后两种物种的死亡率均为100%。这些生物杀螨剂和生物防治剂之间的相互作用应在田间条件下进行测试,以进一步评估这些衍生物的潜在生态选择性。
更新日期:2020-05-18
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