一、发生期的预测 农业害虫的预测预报,是进行害虫综合防治的重要前提。只有及时而准确地预测害虫的发生和危害趋势,才能制订出正确的防治对策,采取有效的防治措施,扑灭害虫危害。 预测预报是建立在了解和掌握害虫的生物学,生态学的基础上,预测害虫在时间和空间上的变化规律。农业害虫的预测预报一般包括三方面的内容:即发生期、发生量和发生危害趋势。按预测期的长短,可分为短期预测(又称近期)、中期预测和长期预测三种。 1.短期预测:根据害虫前一虫期的发生情况,推测后一虫期的发生时间与种群动态,以确定防治 First, the prediction of the occurrence Prediction of agricultural pests is an important prerequisite for comprehensive pest control. Only by timely and accurate prediction of the occurrence of pests and the trend of harm, we can formulate the correct prevention and control measures to take effective prevention and control measures to eliminate pests. Prediction and forecasting is based on understanding and mastering the biology and ecology of pests and predicting the changing rules of pests in time and space. Prediction of agricultural pests generally include three aspects: the occurrence, occurrence and trend of occurrence of hazards. According to the length of the forecast period, can be divided into short-term forecast (also known as recent), medium-term forecast and long-term forecast three. 1. Short-term prediction: According to the occurrence of the pre-pest period, we speculate the occurrence time and population dynamics of the latter period to determine the prevention and treatment