甜菜夜蛾卵和成虫携带核型多角体病毒对种群数量的影响

摘要

在室内分别测定了甜菜夜蛾的卵、雌蛾和雄蛾分别携带甜菜夜蛾核型多角体病毒(SeNPV)对其卵孵化率、幼虫存活率及单雌产卵量的影响.结果表明:甜菜夜蛾卵块携带SeNPV后,卵孵化率和幼虫存活率均显著下降.雌、雄蛾分别携带病毒再交尾后,对单雌产卵量、卵孵化率和幼虫的存活率也有显著影响,并且不同带毒量处理间存在显著差异,表现为带毒量越高,单雌产卵量越少、卵孵化率和幼虫存活率越低.同等带毒处理条件下,卵、雌蛾和雄蛾带毒3种处理方式对甜菜夜蛾种群数量的影响没有显著差异.说明SeNPV能通过甜菜夜蛾的卵、雌蛾和雄蛾3种虫态进行垂直传播,可以明显抑制甜菜夜蛾种群数量的增长,为昆虫性诱剂和病毒集成技术在田间的应用提供了理论依据.%The effects of the eggs,males and females carrying Spodoptera exigua nuclear polyhedrosis virus (SeNPV) on lifetime fecundity,egg hatching and larval survival rate in a natural strain of S.exigua were detected in the laboratory.The results showed that the egg hatch and larval survival rate of S.exigua carrying SeNPV were significantly decreased compared with the control.Males and females carrying SeNPV also had significant effects on lifetime fecundity,egg hatching and larval survival rate.Furthermore,there were significant differences between different treatment concentrations,showing that the greater the concentration,the fewer fecundity and lower hatchability and larval survival.In addition,there was no significant difference in the control effect after egg masses,females and males were infected with SeNPV.These studies suggested that SeNPV could be transmitted to the offspring by three stages,including eggs,females and males,and significantly inhibited the population dynamics of S.exigua.The results provide a theoretical basis for the application of the insect sex attractant integrated with the virus technology in the field.