【摘要】 害虫混合种群防治指标可根据对害虫混合种群—作物生态经济系统了解的程度,采用1、标准害虫防治指标法;2、害虫混合危害损失模型法;3、固定经济允许损失水平法等进行确定。更多还原

【Abstract】 The chemical control threshold of mixed population of insect pests were approached according to the various degrees of knowledge of the pest mixed population-crops-ecologica leconmy system, the threshold might be determined by three methods: 1. by the control threshold of standard pest, 2. by the model of the injuried loss caused by pest mixed population, 3. by the fixed ecuomic, tolerable injuried level.更多还原