Effects of photoperiod and temperature on the emergence, behavior and pathogen infection of Carposina sasakiiMatsumura
Author of the article:ZHAO Nan1, 2** GUO Ting-Ting2 YU Yi2 ZHANG Si-Cong2 MEN Xing-Yuan2 SUN Ting-Lin2 XU Yong-Yu1**
Author's Workplace：1. College of Plant Protection, Shandong Agricultural University, Taian 271018, China; 2. Key Laboratory for Plant Virology of Shandong,Institute of Plant Protection, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Key Words：Carposina sasakii, overwintering larva, occurence rate, occurence regularity, infection rate
Abstract： [Objectives] Because the survival rate of overwintering Carposina sasakii Matsumura larvae determines the population size in the following year, controlling larvae is vital for the effective control of this pest in the field. Photoperiod and temperature had great effects on the survival and emergence of overwintering larvae after termination of diapause, and understanding of these effects will help improve comprehensive control in the field. [Methods] The emergence and pathogen infection rate of overwintering C. sasakii larvae were monitored under different temperatures and photoperiods under laboratory conditions. [Results] Overwintering larvae were present for between 20 and 116 days. Although temperature had an obvious effect on the the larval emergence rate (2011, df=3, F=9.9, P<0.05; 2012, df=3, F=5.519, P<0.05), photoperiod did not (2011, df=2, F=0.577, P>0.05; 2012, df=2, F=9.9, P>0.05). The rate of infection of larvae with Beauveria bassiana significantly increased with temperature (2011, df=3, F=65.713, P<0.05; 2012, df=3, F=29.198, P<0.05), but the rate of infection by bacteria was significantly reduced (2011, df=3, F=28.705, P<0.05; 2012, df=3, F=38.97, P<0.05). [Conclusion] Overwintering C. sasakii larvae were present for a relatively long time with no obvious peak of abundance. Temperature had a significant effect on larval abundance and the rate of infection by B.bassiana.