对害虫具自然控制能力的益害比指标模型研究

在害虫测报和防治工作中,经常要考虑天敌与害虫数量的比例问题,以决定是否需对害虫进行防治或决定相应的防治措施。如果采取防治措施过早,不能充分发挥天敌的自然控制作用,则会浪费人力物力;如采用化防还会加

Study on Model of Natural Enemy/Pest Index Indicating Natural Contorl Capacity to Pest.

Study on hindered increment of pest population by natural enemy is performed to analyze the natural enemy/pest index indicating natural control capacity to pest. Based on the assumption of pest population having a Logistic increment, a natural enemy-pest ratio index model is established. Taking the control of cotton aphid by its natural enemy as an example, this paper discussed the application of this model in pest prevention and cure. A quantitative model of artificial supplement of natural enemy is deduced, and incorrect principles about the determinations of reasonable natural enemy-pest ratio index and supplement amount of natural enemy are clarified.