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14 March 2024 Performance of Spodoptera litura (Lepidoptera: Noctuidae) in responses to different amplitudes of alternating temperatures across permissive warm temperature regimes
Tingfang Zhong, Liwen Gong, Yingru Pan, Junwei Li, Aiying Lu, Liming Liu, Haiyan Wu, Zihua Zhao, Leyun Wang
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Abstract

Climate change involves changes in the pattern of temperature fluctuations and the frequency and magnitude of thermal extremes. It is essential to investigate how insects respond to increased temperature variations, especially for species that usually experience diel temperature variations extending to thermal performance limits. To explicitly elucidate the effects of sizes of amplitudes of temperature variations, we used daily alternating temperatures with an equivalent mean of 28 °C to investigate the impact of different fluctuation amplitudes (± 0 °C, ± 2 °C, ± 4 °C, and ± 6 °C) across permissive temperature regimes on the performance of Spodoptera litura Fabricius, a highly destructive polyphagous pest of crops and vegetables in tropical and temperate climates. Amplitudes of temperature fluctuations significantly affected developmental durations, adult life spans, pupal weights, fecundity, and fertility of S. litura. The survival rates from the egg stage to the adult eclosion did not differ significantly across different temperature treatments. The developmental durations of individual life cycles significantly increased with larger amplitudes in 3 fluctuating temperature treatments.The pupal weight was significantly lower and the adult life span was significantly shorter in the ± 6 °C treatment in all treatments. Fecundity and fertility were significantly reduced in the ± 6 °C treatment, making the continuation of generations nearly impossible. The results should provide critical information for understanding the ecology of this widespread pest under diel, seasonal, and global climate changes.

Tingfang Zhong, Liwen Gong, Yingru Pan, Junwei Li, Aiying Lu, Liming Liu, Haiyan Wu, Zihua Zhao, and Leyun Wang "Performance of Spodoptera litura (Lepidoptera: Noctuidae) in responses to different amplitudes of alternating temperatures across permissive warm temperature regimes," Journal of Economic Entomology 117(3), 1041-1046, (14 March 2024). https://doi.org/10.1093/jee/toae044
Received: 5 January 2024; Accepted: 27 February 2024; Published: 14 March 2024
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KEYWORDS
Brassica
fluctuating temperature
global warming
Jensen's inequality
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