人工饲养叉角厉蝽对草地贪夜蛾的捕食效能评价

Predation Capacity of Different Instars of Eocanthecona furcellata Reared with Artificial Diets to Spodoptera frugiperda

为评价我国西南地区多食性土著天敌叉角厉蝽人工饲料的饲养效果,研究经人工饲料饲养的叉角厉蝽2至5龄若虫及成虫对草地贪夜蛾3龄幼虫的捕食功能反应.结果表明:叉角厉蝽2至5龄若虫及成虫对草地贪夜蛾3龄幼虫的捕食反应功能均符合HollingⅡ圆盘方程.叉角厉蝽2龄若虫至成虫对草地贪夜蛾3龄幼虫的理论最大日捕食量分别为7.49头、15.46头、26.85头、36.96头、30.27头.本研究发现人工饲养的叉角厉蝽具备对草地贪夜蛾的捕食能力,且5龄叉角厉蝽相比于其他龄期的叉角厉蝽拥有更强的控害能力.研究结果为利用叉角厉蝽的规模化饲养及应用于草地贪夜蛾防控提供理论依据与支撑.

This study aimed at evaluating the predatory ability of different instars of Eocanthecona furcellata to Spodoptera frugiperda.The predation function response was conducted under the laboratory condition to evaluate the predation ability of the 2ndto 5thinstar and adults of E.furcellata againstthe 3rdinstar of S.frugiperda.The results showed that the predation function response of the 2nd,3rd,4th,5thinstar and adults of E.furcellata on the 3rdlarvae of S.frugiperda were in accordance with the HollingⅡequation.With the maximum prey density,the daily maximum predation of E.furcellata from the 2ndinstar nymph to the adult was 2.9,6.7,13.7,17.3 and 15.5 individuals,respectively,and the theoretical maximum predation of corresponding stages of E.furcellata were 7.49,15.46,26.85,36.96 and 30.27 individuals,respectively,indicating that the 5thinstar larvae of E.furcellata had stronger control ability than that of the other instar nymphs.This study built a valuable foundation for the mass rearing and application of E.furcellata for biological control of the fall armyworm S.frugiperda.