蠋蝽对茄二十八星瓢虫的捕食功能反应

【目的】明确蠋蝽对茄二十八星瓢虫的捕食能力。【方法】在实验室条件下测定蠋蝽5龄若虫对茄二十八星瓢虫2和4龄幼虫的捕食功能反应及搜寻效应。【结果】蠋蝽5龄若虫对茄二十八星瓢虫2和4龄幼虫的捕食行为均符合Ⅱ型功能反应;随着茄二十八星瓢虫密度的增加,蠋蝽的搜寻效应逐渐降低,蠋蝽5龄若虫对茄二十八星瓢虫2龄幼虫的搜寻效应明显大于4龄幼虫;蠋蝽5龄若虫对茄二十八星瓢虫2和4龄幼虫的实际最大捕食量分别为15和10头。【结论】蠋蝽5龄若虫对茄二十八星瓢虫幼虫具有较好的捕食作用。

Study on the predatory functional response of Arma chinensis (Fallou) to Henosepilachna vigintioctopunctata (Fabricius)

【Aim】 To examine the predatory capacity of Arma chinensis on Henosepilachna vigintioctopunctata. 【Method】 We measured the predatory function response and searching efficiency of the 5th instar nymphs of A. chinensis to the 2nd and 4th instar larvae of the H. vigintioctopunctata. 【Result】 Our results demonstrated that the predatory function responses of the 5th instar nymphs of A. chinensis to the 2nd and 4th instar larvae of H. vigintioctopunctata conformed to the type Ⅱ functional response. When the density of H. vigintioctopunctata increased, the searching efficiency of A. chinensis gradually decreased. In addition, the searching efficiency of the 5th instar nymphs for the 2nd instar larvae was significantly higher than that for the 4th instar larvae. The maximum numbers of 2nd and 4th instar larvae of H. vigintioctopunctata predated by the 5th instar nymphs were 15 and 10, respectively. 【Conclusion】 In summary, our data indicated that A. chinensis has a beneficial predation effect on H. vigintioctopunctata.