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The insecticidal activity and mechanism of tebuconazole on Nilaparvata lugens (Stål).

Authors :
Cai, Yongfeng
Ren, Zhijie
Li, Chengyue
Cai, Tingwei
Yu, Chang
Zeng, Qinghong
He, Shun
Li, Jianhong
Wan, Hu
Source :
Pest Management Science; Sep2023, Vol. 79 Issue 9, p3141-3148, 8p
Publication Year :
2023

Abstract

BACKGROUND: Previous studies have shown that fungicides have insecticidal activity that can potentially be used as an insecticide resistance management strategy in the brown planthopper Nilaparvata lugens (Stål). However, the mechanism that induces mortality of N. lugens remains elusive. RESULTS: In the present study, the insecticidal activities of 14 fungicides against N. lugens were determined, of which tebuconazole had the highest insecticidal activity compared with the other fungicides. Furthermore, tebuconazole significantly inhibited the expression of the chitin synthase gene NlCHS1; the chitinase genes NlCht1, NlCht5, NlCht7, NlCht9, and NlCht10; and the β‐N‐acetylhexosaminidase genes NlHex3, NlHex4, NlHex5 and NlHex6; it significantly suppressed the expression of ecdysteroid biosynthetic genes as well, including SDR, CYP307A2, CYP307B1, CYP306A2, CYP302A1, CYP315A1 and CYP314A1 of N. lugens. Additionally, tebuconazole affected the diversity, structure, composition, and function of the symbiotic fungi of N. lugens, as well as the relative abundance of saprophytes and pathogens, suggesting that tebuconazole reshapes the diversity and function of symbiotic fungi of N. lugens. CONCLUSION: Our findings illustrate the insecticidal mechanism of tebuconazole, possibly by inhibiting normal molting or disrupting microbial homeostasis in N. lugens, and provide an important rationale for developing novel insect management strategies to delay escalating insecticide resistance. © 2023 Society of Chemical Industry. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
1526498X
Volume :
79
Issue :
9
Database :
Complementary Index
Journal :
Pest Management Science
Publication Type :
Academic Journal
Accession number :
169707709
Full Text :
https://doi.org/10.1002/ps.7493