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近十来年,我市小麦病虫草的为害逐年加重。据统计,1975—1986年12年中,1981—1986年(以下简称后6年)病虫发生面积和为害率均比1975—1980年(以下简称前6年)增长2.1倍,后6年年平均病虫发生452万亩次,造成损失(包括挽回损失)3895万公斤,最高达7016万公斤,已构成小麦高产的重大障碍,是急待解决的问题。
In the past ten years, the harm of wheat and insect pests in our city has been increasing year by year. According to the statistics, in the 12 years from 1975 to 1986, the pest occurrence area and the damage rate in 1981-1986 (hereinafter referred to as the latter 6 years) increased by 2.1 times than that in 1975-1980 (hereinafter referred to as the first 6 years) An average of 4.52 million mu of pests and diseases occurred, resulting in losses (including the recovery of losses) of 38.95 million kilograms and a maximum of 70.16 million kilograms. This has constituted a major obstacle to the high yield of wheat and is an urgent issue to be solved.