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© 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Simple Summary

As poikilotherms, insects are sensitive to ambient environmental conditions; therefore, it is important to gauge how heat stress affects their survival and fitness. The leaf beetle Monolepta hieroglyphica (Motschulsky) is a key pest within farmlands in China. This study investigated the effects of different temperatures (i.e., 25, 28, 31, and 34 °C) on the survival, reproduction, feeding capacity, and antioxidant capacity of adult leaf beetles. Laboratory assays showed that elevated temperatures (i.e., 31 and 34 °C) had a negative effect on the survival and reproduction of M. hieroglyphica. As temperatures increased (25 °C to 34 °C), the feeding capacity of M. hieroglyphica decreased significantly. Lastly, superoxide dismutase (SOD), catalase (CAT), glutathione-s-transferase (GST), and peroxidases (POD) in leaf beetles were significantly affected by ambient temperature. By assessing the thermal biology of leaf beetles, these laboratory assays can provide a theoretical basis for the development of integrated pest management (IPM) programs for M. hieroglyphica.

Abstract

Monolepta hieroglyphica (Motschulsky) (Coleoptera: Chrysomelidae) is widely distributed in China and is polyphorous, being a major pest to cash crops, such as corn, cotton, and millet. Given the increasing severity of the greenhouse effect in recent years, we aimed to investigate the adaptability of M. hieroglyphica adults to varying temperatures. In this study, we assessed the survival, longevity, fecundity, feeding capacity, and antioxidant capacity of leaf beetle adults under laboratory conditions at 25–34 °C. Elevated temperatures (i.e., 31 and 34 °C) had (negative) impacts on M. hieroglyphica adults’ survival and reproduction. Similarly, the temperature negatively affected the feeding capacity of M. hieroglyphica adults, with the impact becoming more pronounced as the temperature increased. Under the same treatment time, the SOD and CAT activity levels increased with the increase in treatment temperature. The GST activity levels showed a decreasing trend. The POD activity showed a biphasic response to increasing temperatures, first decreasing and then increasing. The above indicates that different antioxidant enzymes of M. hieroglyphica adults have different levels of sensitivity to high temperatures. In the laboratory, our work analyzes the response of M. hieroglyphica adults to temperature from ecological and physiological research perspectives and provides strategies for strengthening its subsequent integrated pest management (IPM) under conditions of global warming or extreme weather events.

Details

Title
Impact of Different Temperatures on Activity of the Pest Monolepta hieroglyphica Motschulsky (Coleoptera: Chrysomelidae)
Author
Shi, Rongrong 1 ; Hao, Jianyu 1 ; Zhang, Yue 1 ; Wang, Qinglei 1 ; Liu, Chunqin 1 ; Yang, Qing 2 

 Hebei Key Laboratory of Soil Entomology, CangZhou Academy of Agriculture and Forestry Sciences, Cangzhou 061001, China; [email protected] (R.S.); [email protected] (J.H.); [email protected] (Y.Z.); [email protected] (Q.W.) 
 Doctoral Work Laboratory, Department of Agricultural and Animal Husbandry Engineering, Cangzhou Technical College, Cangzhou 061001, China 
First page
222
Publication year
2025
Publication date
2025
Publisher
MDPI AG
e-ISSN
20754450
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3171067733
Copyright
© 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.