中华草蛉幼虫捕食马铃薯甲虫卵的功能反应研究

【目的】研究田间常见天敌中华草蛉1、2、3龄幼虫捕食马铃薯甲虫卵的功能反应,为新疆马铃薯甲虫天敌利用提供理论和实际应用依据。【方法】采用田间观察、室内饲养观察方法,分别用HollingⅡ型圆盘方程和HollingⅢ型新模型对结果进行拟合。【结果】中华草蛉1～3龄幼虫对马铃薯甲虫卵的日最大捕食量分别为4.856 11、2.858 0和33.679 2,瞬时攻击率分别为1.157 71、.149 9和1.338 4,处置时间分别为0.205 90、.077 8和0.029 7,随着龄期的增大其对害虫的控制能力增强,而随着食物密度的增加寻找效应均相应地降低;HollingⅢ型新模型得出:中华草蛉1～3龄幼虫的最佳寻找密度分别为2.643 2、6.429 5和12.331 0,当利用其防治马铃薯甲虫时最佳益害比分别为1:3、1:6和1:12,研究结果可作为田间防治的参考。【结论】田间调查和室内饲养观察表明,中华草蛉是捕食马铃薯甲虫卵的很有效的天敌之一,其幼虫在新疆对马铃薯甲虫进行生物防治方面具有潜在的应用价值。

Study on the Functional Response of Chrysopa Sinica Tjeder to Predation of the Eggs of Leptinotarsa decemlineata Say

【Objective】The purpose of the research on the functional response of 1st,2nd,3rd instar larvae of Chrysopa sinica Tjeder to predation of the eggs of Leptinotarsa decemlineata was to provide theoretical and practical basis for the application of natural enemy.【Method】By observation in field,reared and determined the functional reactions in climatic chambers,the experimental results were fitted with HollingⅡmodel patter and Holling III new model separately.【Result】The results of HollingⅡmodel patter shows that the maximum predation capacity of 1st to 3rd instar larvae are 4.856 1,12.858 0 and 33.679 2,the instantaneous attack rates are 1.157 7,1.149 9 and 1.338 4,the disposal time are 0.205 9,0.077 8 and 0.029 7 respectively.The predacious ability increased strongly along with the larva growth,but the hunting effect decreased with the increasing of prey density.According to the results of Holling III new model,the best hunting density of 1st to 3rd instar larvae are 2.643 2,6.429 5 and 12.331 0 separately.The optimal ratios of Chrysopa sinica Tjeder larvae to Leptinotarsa decemlineata are 1∶3,1∶6 and 1∶12.This research results can be provided as a significant reference in the field control.【Conclusion】It was indicated that Chrysopa sinica Tjeder is an effective insect predator to Leptinotarsa decemlineata.The lacewing larva has potential value of biological control on Leptinotarsa decemlineata in practice in Xinjiang.