龟纹瓢虫捕食棉铃虫卵的功能反应与寻找效应研究

Studies on the Predatory Function Responsts and Searching Efficiency of Propylaea japonica on Eggs of Heliothis armigera

测定龟纹瓢虫Propylaeajaponica(Thunberg)捕食棉铃虫Heliothisarmigera(Hübner)卵的结果表明,其捕食量随猎物的密度增加而上升,当猎物增加到一定水平,捕食量趋向稳定。拟合捕食功能反应曲线,符合Holling功能反应Ⅱ型,其模型为Na=0.6660N/(1+0.0322N)。日最大捕食量为21粒。龟纹瓢虫寻找效应随自身密度增加而降低,模型为:E=0.2159×P-1.4427干扰模型为:E=0.4855×P-2.4247。3个模型为正确评价龟纹瓢虫控制棉铃虫的作用提供了科学依据。

The experiment results showed that the functional response models that propylaea japonica preyed on Heliothis armigera are as follows:Na=0.6660N/(1+0.0322N).Relationship between amount of Heliothis armigera by ladybird nad density showed a negative accelerative curre.The daily maximum number of Heliothis armigera preyed the oretically by ladybirds were 21.The searching efficiency decreases with increase of preator density,and the mathematical models were:E=0.2159×P-1.4427?The nutural inter ference among individual predators and preys could described by Hassell(1969)equation:E=0.4855×P-2.4247.The above three models provide the scientific basis for controlling He liothis armisgera used propylaea japonica.