根据省植保总站、各市植保站及区域测报站的田间调查结果,结合对历史资料统计分析,参照1997年气象实况及未来天气预报,对1998年农作物主要病虫害发生趋势展望如下: 1 麦蚜 大发生,发生程度接近1997年。由于麦蚜的轻重主要受4～5月份的气象条件影响,与其它因素关系不密切。1998年春季降水偏少,五月份气温偏高,利于麦蚜发生。 According to the field survey results of provincial plant protection depots, plant protection stations and regional measuring stations in cities, combined with statistical analysis of historical data and reference to the 1997 meteorological data and future weather forecasts, the trends of major pests and diseases in crops in 1998 are as follows: , The degree of occurrence close to 1997. As the severity of wheat aphids by April to May meteorological conditions, and other factors are not closely related. Precipitation in spring 1998 less than normal, high temperatures in May, which is conducive to the occurrence of wheat aphid.