蠋蝽成虫对草地贪夜蛾不同龄期幼虫的捕食能力

为了探究蠋蝽Arma chinensis(Fallou)对草地贪夜蛾Spodoptera frugiperda(J.E.Smith)的生防潜力,在室内条件下测定了蠋蝽成虫对草地贪夜蛾3、4、5龄幼虫的捕食能力。结果表明:雌性成虫对草地贪夜蛾3、4、5龄幼虫的日最大捕食量分别为59.7、23.4、9.0头;瞬时攻击率分别为1.081±0.133、1.247±0.116、0.984±0.159;处理时间分别为(0.017±0.001)、(0.043±0.002)、(0.111±0.014)d。雄性成虫对草地贪夜蛾3、4、5龄幼虫的日最大捕食量分别为58.9、22.5、8.3头;瞬时攻击率分别为0.964±0.118、1.248±0.095、1.025±0.183;处理时间分别为(0.017±0.002)、(0.044±0.002)、(0.121±0.015)d。蠋蝽成虫对草地贪夜蛾3、4、5龄幼虫都能捕食,对3龄幼虫捕食量最大,最喜欢捕食4～5龄幼虫,雌雄成虫都对4龄幼虫的瞬时攻击率最高。试验证实蠋蝽对草地贪夜蛾具有较好的控害效果,可用于对草地贪夜蛾的防控实践。

Predation of adult of Arma chinensis to larvae of Spodoptera frugiperda

In order to investigate the biological control potential of Arma chinensis (Fallou) on Spodoptera frugiperda (J.E.Smith), the ability of adults to prey on 3rd, 4th and 5th instar larvae under indoor conditions was studied. The results showed that the maximum daily predation amount of female adults to the 3rd, 4th and 5th instar larvae of the fall armyworm was 59.7, 23.4 and 9.0 individuals, respectively. The instantaneous attack rates were 1.081±0.133, 1.247±0.116, 0.984±0.159, respectively. The handling time was 0.017±0.001, 0.043±0.002, 0.111±0.014 days, respectively. The maximum prey consumed daily of male adults to 3rd, 4th and 5th instar larvae was 58.9, 22.5 and 8.3, respectively. The instantaneous attack rates were 0.964±0.118, 1.248±0.095 and 1.025±0.183, respectively. Handling time was 0.017±0.002, 0.044±0.002 and 0.121±0.015 days, respectively. Adults of A.chinensis can prey on 3rd, 4th, and 5th instar larvae of S.frugiperda. The daily predation amount of A.chinensis adults on the 3rd instar larvae of S.frugiperda was the largest, and they prefer to prey on 4th and 5th instar larvae. The instantaneous attack rates of both male and female adults of A.chinensis against 4th instar larvae of S.frugiperda is the highest. The results indicate that A.chinensis has good control effect on S.frugiperda and can be used for the prevention and control of the moth.