Effects of temperature in adult period on the reproduction behavior of the rice leaf roller, Cnaphalocrocis medinalis (Guenée)

Author of the article:SUN Bei-Bei, ZHANG Lei, JIANG Xing-Fu, LUO Li-Zhi

Author's Workplace：State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences

Key Words：Cnaphalocrocis medinalis; temperature; sensitive stage; preoviposition period; total fecundity; period of first oviposition; mating percentage

Abstract：Environmental conditions especially temperature is an important factor that affect adult reproduction of insects. In this paper, influences of low temperature on reproduction and longevity of the rice leaf roller, Cnaphalocrocis medinalis (Guenée), were investigated by cold treatment on different days after adult emergence. The results indicate that only on 1-day-old cold treatment (15℃) can significantly accelerate female reproduction and increase the synchrony of first egg-laying, shorten the preoviposition period and the period of first oviposition, increase the total fecundity mating frequency, and mating percentage. However there are no significant effect on reproduction except significantly shorten the period of first oviposition when adults were treated by cold on other days. Furthermore, in another cold treatment (10℃), there are no significant effect on reproduction, but significantly shorten the adult longevity of C. medinalis when adult were treated by 10℃ for 24 h on day 1 after emergence. All these results suggest that day 1 after emergence is the sensitive stage that C. medinalis response to low temperature and during this period adult reproduction can be accelerated by the stress of cold (15℃).