根据病虫基数、长期天气预报、作物长势及天敌等情况,并结合历史资料,采用多种方法综合分析及山东省农作物病虫发生趋势,对下半年主要作物病虫害发生趋势做出了预报。一、气象因子据省气象台预报,平均气温:7月份,全省一般26.0-27.5℃,接近常年或略偏高;半岛地区24.5- 25.5℃,较常年略偏低。8月份,全省一般为25.5- According to the pests and insect pests base, long-term weather forecast, crop growth and natural enemies, combined with historical data, comprehensive analysis of a variety of methods and crop pest occurrence trends in Shandong Province, forecast the main crop pests and diseases in the second half trends. First, meteorological factors According to the Provincial Meteorological Observatory forecast, the average temperature: July, the province is generally 26.0-27.5 ℃, near perennial or slightly higher; peninsula 24.5- 25.5 ℃, slightly lower than the average. In August, the province is generally 25.5-