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Effects of spirotetramat insecticide on life history traits and population growth of Encarsia formosa (Hymenoptera: Aphelinidae)
Biocontrol Science and Technology ( IF 1.4 ) Pub Date : 2021-01-17 , DOI: 10.1080/09583157.2021.1873248
Tanja Drobnjaković 1 , Dejan Marčić 1
Affiliation  

ABSTRACT

Sublethal effects of a spirotetramat insecticide on life history traits and population growth of two local Serbian populations (Bujanovac and Negotin) and one commercial Dutch population (the Dutch strain) of Encarsia formosa Gahan (Hymen.: Aphelinidae) were evaluated in laboratory bioassays. Median lethal concentrations of spirotetramat estimated in the acute toxicity bioassay with adults (250 mg/l for Bujanovac and Negotin populations, and 225 mg/l for the Dutch population), significantly reduced the longevity of adult wasps exposed for 48 h to fresh residues by 1.6–2.8 days. Total parasitism of exposed adults, adult emergence in the F1 generation, and the instantaneous rate of increase of surviving wasp populations were significantly reduced (<30%). When applied to pupae within parasitised hosts (at LC50s estimated in the acute toxicity bioassay with pupae; 700 mg/l for Bujanovac and 600 mg/l for the Negotin and Dutch populations), the spirotetramat significantly extended the development of juveniles (by 1–1.4 days), and significantly reduced longevity (by 0.7 days) and the instantaneous rate of increase for the Bujanovac wasps, by 6.1%. According to the estimated acute toxity for both adults and pupae of E. formosa and taking into account the reduction of reproductive and demographic parameters (<30% in bioassays with adults and <10% in bioassays with pupae), spirotetramat can be classified as compatible with E. formasa in integrated whitefly management.



中文翻译:

螺虫乙酯杀虫剂对Encarsia formosa(膜翅目:Aphelinidae)生活史性状和种群增长的影响

摘要

在实验室生物测定中评估了螺虫乙酯杀虫剂对两个当地塞尔维亚种群(Bujanovac 和 Negotin)和一个商业荷兰种群(荷兰菌株)的Encarsia formosa Gahan(处女膜:Aphelinidae)的生活史特征和种群增长的亚致死作用。在成人急性毒性生物测定中估计的螺虫乙酯的半数致死浓度(Bujanovac 和 Negotin 种群为 250 毫克/升,荷兰种群为 225 毫克/升),显着缩短了暴露于新鲜残留物 48 小时的成年黄蜂的寿命1.6-2.8 天。暴露成虫的总寄生,成虫出现在F 1生成,存活黄蜂种群的瞬时增长率显着降低(<30%)。当应用于寄生宿主体内的蛹时(在对蛹的急性毒性生物测定中估计的LC 50 秒;Bujanovac 为 700 毫克/升,Negotin 和荷兰种群为 600 毫克/升),螺虫乙酯显着延长了幼虫的发育(通过 1 –1.4 天),并显着降低了 Bujanovac 黄蜂的寿命(减少了 0.7 天)和瞬时增长率 6.1%。根据对E 的成虫和蛹的估计急性毒性。福尔摩沙并考虑到生殖和人口统计参数的减少(成虫生物测定<30%,蛹生物测定<10%),螺虫乙酯在综合粉虱管理中可归类为与E. formasa兼容。

更新日期:2021-01-17
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