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物危险性病虫害不仅直接影响农业生产，造成农作物减产，质量下降，而且影响农产品的国内外市场信誉和占有率。如 1988年从国外传入唐山的稻水象甲尽管每年投入上亿元巨资和大量人力物力进行专项防治，仍在十来年间扩展到 8个省 (市 )近 33万 hm~2面积，不但造成水稻减产 10％?
Hazard Pests and diseases not only directly affect agricultural production, resulting in reduced production of crops, decreased quality, but also affect the credibility of domestic and foreign markets, agricultural products and market share. For example, the rice water weevil, introduced into Tangshan from abroad, in 1988, has invested a total of 100 million yuan every year in huge amounts of money and manpower and resources for special prevention and control. It is still expanding to nearly 330,000 hm 2 in 8 provinces (cities) Not only caused a 10% reduction in rice production?