预测预报的目的,在于事先掌握虫情,了解松毛虫的发生发展动向,为做好防治工作提供依据。按照松毛虫在数、时、空三方面变化的动态性质和防治上的要求,可以分为发生期、发生量和扩散蔓延预测。 The purpose of forecasting and forecasting is to grasp the insect situation in advance, understand the occurrence and development trend of the pine caterpillars and provide the basis for the prevention and control work. According to the dynamic characteristics of pine caterpillars in the number, time and space changes and control requirements, can be divided into the occurrence, occurrence and spread of spread forecast.