Biological activity and field efficacy of Bacillus thuringiensis kurstaki strains with protein film adjuvants (PFAs) against Plutella xylostella (Lepidoptera: Plutellidae)

文献类型： 外文期刊

第一作者： Zhou, Le

作者： Zhou, Le;Wang, Yu;Liu, Zi-Yao;Liu, Xiang;Zhai, Zheng;Cao, Sheng-Kai;Zaghloul, Heba A. H.;Yu, Huan;Zhang, Yong-Sheng;Zhou, Le;Wang, Yu;Liu, Zi-Yao;Liu, Xiang;Zhai, Zheng;Yu, Huan;Zhang, Yong-Sheng;Cao, Sheng-Kai;Zhao, Qi-Qiang;Zaghloul, Heba A. H.;Shi, Xiao-Bin;Su, Hao

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关键词： Bacillus thuringiensis; protein film adjuvants; Plutella xylostella; Pieris rapae; control effects

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：3.8； 五年影响因子：4.3 ）

ISSN： 1526-498X

年卷期： 2025 年 81 卷 7 期

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收录情况： SCI

摘要： BackgroundDiamondback moth (DBM), Plutella xylostella L. is a globally distributed insect pest with developed resistance to many insecticides such as Cry1Ac proteins of Bacillus thuringiensis (Bt). It is therefore urgent to develop novel Bt bacterial strains with biocontrol activity against the DBM population.ResultsNine Bt var. kurstaki (Btk) strains with high insecticidal activity against DBM larvae were selected, and three of them (B6, P2, and P6) had middle lethal concentrations (LC50) of 39.23 mu g/mL, 3715.08 mu g/mL, and 121.62 mu g/mL, respectively, against 3rd instar DBM at 48 h. The three Btk strains were formulated with three different protein film adjuvants (PFAs) to perform insecticidal activity bioassays on laboratory potted cabbages. B6 and P6 formulations showed a faster insecticidal rate than the control insecticide (Emamectin benzoate, EB), and all caused approximately 100% mortality at 24 h after spraying. Interestingly, B6 demonstrated enhanced adhesion capacity to the leaf surface with the help of PFAs, while P6 showed reduced adhesion. Field control assays showed that B6 and P6 can effectively control the DBM population. However, they were not particularly effective against Pieris rapae larvae.ConclusionThe present study identified two Btk strains with efficient insecticidal activity against DBM in both laboratory and field, as well as three PFAs allowing insecticide dose reduction while retaining efficacy. (c) 2025 Society of Chemical Industry.

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