Journal
JOURNAL OF ASIA-PACIFIC ENTOMOLOGY
Volume 22, Issue 3, Pages 795-801Publisher
KOREAN SOC APPLIED ENTOMOLOGY
DOI: 10.1016/j.aspen.2019.06.004
Keywords
Methoxyfenozide; Lufenuron; Spodoptera exigua; Bioassay; Sublethal effect; Enzyme activity
Categories
Funding
- National Key Research and Development Plan: High Efficient Ground and Aerial Spraying Technology and Intelligent Equipment [2016YFD0200700]
- National Major Project for Developing New Genetically Modified (GM) Crops of China [2016ZX08010005]
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The joint action and sublethal effects of methoxyfenozide and lufenuron were measured against Spodoptera exigua. Methoxyfenozide and lufenuron exhibited optimum synergistic toxicity on S. exigua at a mass ratio of 4:6, and the co-toxicity coefficient (CTC) was 165.705. Third instars larvae of S. exigua were treated with methoxyfenozide (LC15 = 21.004 ng/cm(2)), lufenuron (LC15= 27.134 ng/cm(2)), or a mixture of methoxyfenozide and lufenuron (MML, LC15 = 16.503 ng/cm(2)) through feeding for 72 h. Ingestion of MML by larvae significantly inhibited larval and pupal weights and pupation rate, and prolonged the larval and pupal development of S. exigua compared to individual treatment ofmethoxyfenozide or lufenuron. Both methoxyfenozide and MML treatments significantly decreased the fertility of female S. exigua. No significant changes were observed in case of adult emergence and egg hatching for different treatments. The MML-treated S. exigua exhibited significantly lower activities of polyphenol oxidase (PPO) and cytochrome P450 (CYP450) than those in S. exigua treated separately with methoxyfenozide or lufenuron. Finally, methoxyfenozide, lufenuron, and MML treatments decreased chitinase, acetylcholinesterase (AChE), carboxylesterase (CarE), and glutathione-s-transferase (GST) activities in S. exigua.
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