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Comparative bioactivity of S-methoprene and novel S-methobutene against mosquitoes (Diptera: Culicidae)
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Comparative bioactivity of S-methoprene and novel S-methobutene against mosquitoes (Diptera: Culicidae)
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Comparative bioactivity of S-methoprene and novel S-methobutene against mosquitoes (Diptera: Culicidae)
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Journal Article
Comparative bioactivity of S-methoprene and novel S-methobutene against mosquitoes (Diptera: Culicidae)
2023
Overview
Mosquitoes and mosquito-borne illnesses significantly impact public health and human well-being. To address this concern, environmentally compatible larvicides have become a critical component of integrated mosquito management. However, the number of available larvicides is at a historical low. Currently, larvicides that harness microbials and insect growth regulators account for most products. Screening of new active ingredients (AIs) or improvement of existing AIs is thus necessary to augment the capacity for mosquito control. S-methoprene possesses a similar molecular structure and identical function to mosquito juvenile hormone and has been one of the main targets for research and development. The efficacy and safety of S-methoprene have been well documented since the late 1960s, and numerous products have been commercialized to combat pests of economic importance. However, S-methoprene is vulnerable to environmental factors that lead to its degradation, which has created challenges in formulation development, particularly where extended efficacy is desired. A derivative of S-methoprene, namely S-methobutene, with molecular modification has become available. This derivative has demonstrated an enhanced activity of inhibition of emergence (IE) against species across the Aedes, Anopheles, and Culex genera at IE10, IE50, and IE90. Furthermore, S-methobutene consistently outperformed S-methoprene during a 120-day aging process against the southern house mosquito Cx. quinquefasciatus, where the IE% in S-methobutene was significantly higher than that in S-methoprene on most aging intervals. The former had significantly longer residual activity than the latter. The potential of S-methobutene for further development and application is discussed in consideration of its enhanced activity and stability.
Publisher
Entomological Society of America,Oxford University Press
