Effects of low-concentration spinetoram wax-based bait stations on Bactrocera dorsalis (Diptera: Tephritidae)

• Published in: Pesticide biochemistry and physiology 2023-12, Vol.197, p.105705-105705, Article 105705
• Main Authors: Lin, Jia, Yue, Guoqing, Xiao, Kang, Yang, Deqing, Hao, Xuxing, Zheng, Minlin, Cai, Pumo, Ji, Qing'e
• Format: Article
• Language: English
• ISSN: 0048-3575; 1095-9939
• DOI: 10.1016/j.pestbp.2023.105705

Spinetoram wax-based bait station (SWBB) is a maintenance-free, long-lasting, and eco-friendly management measure for Bactrocera dorsalis. However, the impacts of low-concentration spinetoram on B. dorsalis have not yet been determined. Therefore, our study aimed to determine the impacts of low-concentration SWBBs on the biology, demographics, detoxifying enzymes, and gut microorganisms of B. dorsalis. Our results showed that low-concentration SWBBs posed dose-dependent effects on the lifespan and fecundity of B. dorsalis adults. Both the LC and LC treatments significantly reduced the fecundity, while only the latter led to significant deleterious effects on the longevity of adults. Transgenerational bioassays revealed that exposure to LC significantly affected the development period of larvae and pupae as well as the livability of pre-adult stage of the progeny. However, except for the ovipositional period, no significant effects on the biological traits of F adults were observed. In terms of the F demographic parameters, dose-dependent effects were observed. Moreover, both the LC and LC treatments significantly extended the mean generation time, while the latter remarkably decreased the finite and intrinsic rates. Additionally, the significant induction of CarE activity by the LC and LC treatment was maintained until 24 and 48 h respectively. The CYP450 O-deethylation activity in the LC treatment was significantly enhanced at 24 and 48 h intervals when compared to the control. Regarding the intestinal bacterial community, after B. dorsalis adults were exposed to low-concentration SWBBs, the relative abundances of Providencia and Vagococcus were significantly increased, whereas those of Lactococcus and Brachyspira experienced a significant decrease. The obtained results are expected to serve as a foundation for the application of spinetoram in "lure-and-kill" strategies against B. dorsalis.