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Effects of naturally varying temperatures on growth and development and nutritional indicators of Mythimna separata (Walker) (Lepidoptera: Noctuidae) #MMPMID41388970
Liu T; Zhao H; Cao J; Gao L; Guo Y; Zhao Z; Wang Y; Zhang L
J Econ Entomol 2025[Dec]; ? (?): ? PMID41388970show ga
Mythimna separata is a major migratory agricultural pest in China, with its number of generations varying significantly along latitudinal gradients, posing a serious threat to grain production and security. To address the current lack of fundamental temperature-response data for predicting outbreaks in third-generation occurrence areas, this study systematically investigated the developmental characteristics of this pest under naturally fluctuating temperature conditions. Three complete generations were observed during the April-October 2021 study period, with each generation's developmental progression showing a significant correlation with temperature variations. The second generation developed fastest during the high-temperature period in July, completing its life cycle in only 48.2 d. When the temperature reached approximately 25 degrees C, the developmental duration shortened significantly, but the larval survival rate decreased. Fifth-instar larvae exhibited the strongest environmental adaptability, with starvation tolerance lasting up to 281.4 h. This study provides guidelines for predicting M. separata occurrence in third-generation breeding areas under natural conditions.
J+Econ+Entomol 2025 ; ? (?): ?
