一、什么是害虫管理系统 害虫防治的目的是使虫口密度减少到容许的水平。生物种群与环境组成一个整体,必须查清害虫、天敌、农作物与气象、土壤等环境条件之间的相互联系、相互影响,以揭示害虫种群与其它因素的关系及其变化规律。 田间害虫密度常常需要不断测量,而且施 First, what is the pest management system The purpose of pest control is to reduce the population density to allowable levels. In order to reveal the relationship between the pest population and other factors and their changing rules, it is necessary to find out the mutual relations and interactions between pests, natural enemies, crops and the environmental conditions such as meteorology and soil. Field pest densities often require constant measurement and application