Night warming has mixed effects on development of the fall armyworm, Spodoptera frugiperda (Lepidoptera, Noctuidae) in southern China.

• DOI: 10.20944/preprints202401.0719.v1
• Publication Date: 2024-01-10T00:41:25Z
• Authors: Yang-Cheng Xu; Hai-Peng Chi; Ming-Yue Shi; Zhao-Zhi Lu; Myron P. Zalucki
• Keywords: Fall armyworm

The fall armyworm, Spodoptera frugiperda (Lepidoptera, Noctuidae), is a notorious migratory pest. After invading China in 2019, the species has established as year-round breeding population most of southern provinces. area winter corn this region been increasing due to huge demand fresh consumption which potentially at risk from invasive, although S. growth and development under changing climate unclear, particularly rising temperature during night period. Here we used highest daily temperatures 27℃, 24℃, 20℃ that were 2℃, 4℃, 6℃ lower giving three treatments reflective conditions; GroupⅠ: 27-21℃, 27-23℃, 27-25℃, Group Ⅱ: 24-18℃, 24-20℃, 24-22℃, Ⅲ: 20-14℃, 20-16℃, 20-18℃; evaluate effect on frugiperda. Results show survival rate larvae pupae significantly declined with declining range increasing. Significant developmental effects observed all day-night treatment, except for adults, significant interaction stages egg generation time. Development accelerated along temperature, intermediate (Group Ⅱ). uniformity pupation emergence times are higher high temperature. Predictions FAW warnings local farmers need be adjusted take into account more rapid development. These results will support decision makers develop long-term management strategies China.