七星瓢虫对两种麦蚜控制作用的模拟研究

应用二次回归旋转组合设计方法研究了七星瓢虫成虫、幼虫与两种麦蚜共存系统中瓢虫对麦长管蚜和禾谷缢管蚜的捕食量模型。结果表明七星瓢虫对两种麦蚜的捕食量随着瓢虫密度的增加而减少．随着该种麦蚜密度的增加而增加．且七星瓢虫无选择性。七星瓢虫不同个体间的干扰作用对其捕食麦长管蚜数量有显著影响,两种麦蚜数交互作用对七星瓢虫捕食禾谷缢管蚜数量影响显著。该模型可用来预测田间蚜虫的变化．指导麦田蚜虫防治。

MATHEMATICAL SIMULATION MODELS FOR PREDATION OF SEVEN SPOT LADYBIRD TO WHEAT APHIDS IN THE ENEMY- PEST COEXISTENCE SYSTEM

The mathematical models describing a coexistence system which contains adults and larvae of seven spot ladybird and two wheat aphids were studied by rotation composite design of quadratic regression The results showed that the feeding amount of seven spot ladybird to two wheat aphids decreased as the predator density increased and increased as the wheat aphids density increased, and seven spot ladybird was no selective to two wheat aphids The inter-interference between different individual of adults of ladybird has a significant effect on feeding amount of ladybird to Macrosiphum avenae ; inter-interference between two species in wheat aphid has a significant effect on feeding amount of ladybird to Rhopalosiphum padi The models were applied on forecasting aphid density of wheat field, and the results may be used in guiding the control of wheat aphid