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Temperature and relative humidity mediated life processes of Spodoptera species (Lepidoptera: Noctuidae)

Published online by Cambridge University Press:  30 September 2024

Rameswor Maharjan
Affiliation:
Crop Production Technology Research Division, Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, 50424 Miryang, Republic of Korea
Seoyeon Hong*
Affiliation:
Crop Production Technology Research Division, Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, 50424 Miryang, Republic of Korea
Youngnam Yoon
Affiliation:
Crop Production Technology Research Division, Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, 50424 Miryang, Republic of Korea
Yunwoo Jang
Affiliation:
Crop Production Technology Research Division, Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, 50424 Miryang, Republic of Korea
Kido Park
Affiliation:
Crop Production Technology Research Division, Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, 50424 Miryang, Republic of Korea Department of Central Area Crop Science, National Institute of Crop Science (NICS), Rural Development Administration (RDA), 16608 Suwon, Republic of Korea
*
Corresponding author: Seoyeon Hong; Email: agriculture63@korea.kr

Abstract

Anthropogenic-mediated climate change is expected to negatively affect pest management in agriculture. Hence, we investigated the oviposition, immature mortality, and developmental processes of Spodoptera species (Spodoptera exigua (Hübner) and Spodoptera litura (Fabricius)) under different temperatures (20, 25, and 30°C) and relative humidity (RH) (30–35, 50–55, 70–75, and 90–95%) conditions. For fecundity, mouths of each Spodoptera species were released into a rectangular box whose inner walls were covered with a sheet of white paper for each combination of temperature and RH. The mouths were kept inside the box to deposit eggs for 72 h. Temperature and RH significantly affected the fecundity, with the maximum number of eggs laid in 70–75% at 30°C. The highest egg and larval mortalities were recorded in 30–35 and 90–95% RH, respectively. Temperature and RH greatly affected the developmental period (egg–adult) and adult emergence rate. The rapid development was recorded in 70–75% RH at 30°C. Higher number of adults was found with an increase in temperature and RH. Adult longevity was significantly higher in 70–75% RH at 20°C. Based on the present study's findings, temperature and RH had an individual apparent effect on the developmental processes of Spodoptera species instead of an interactive effect. Therefore, there is need for an in-depth study of the influence of several climatic factors, including CO2, on the developmental modality and demographic changes of Spodoptera species to assess the impacts of climatic components and the sustainable development of management strategies.

Information

Type
Research Paper
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

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