小麦禾缢管蚜种群动态的研究

A Study on the Population Dynamics of Rhopalosiphum padi on Wheat.

本文采用平均密度（Ｘ），聚块性指标（ｍ／ｍ）和有蚜株率（Ｆ）对小麦禾缢管蚜种群动态进行模糊聚类分析。找出了其种群消长的４个时期：点片发生期，始盛期，猖獗期和衰退期；防治重点应在始盛期，即瓢虫卵期，以达到经济有效，充分保护利用天敌的目的。

We discovered four critical times to describe population fluctuation of Rhopalosiphum padi by fuzzy cluster analysis of population dynamics, that is pest patch emerging period,early peak period, surgence and decay period. It’s control should be intensive during early peak period,synchronous to egg stage of coceinellids,so that economic tenefit can be reach at maximum, and natural enemies can be protected without harm from insecticides.