Selective predation of Cantheconidea furcellate Wolff on the 2nd instar larvae,4th instar larvae and the 6th instar larvae of spodoptera litura in coexistence of three prey-age types was studied.

• 应用二次回归通用旋转组合设计探讨了叉角厉蝽与斜纹夜蛾低龄幼虫、中龄幼虫和高龄幼虫共存系统中，天敌对猎物不同年龄等级的选择捕食作用，建立了3个年龄等级的幼虫被捕食量模型。