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美国有大量的粮食出口,从粮食生产地经运输到买主手中都存在着害虫感染问题.通常准许从美国出口的粮食须由美国农业部和美国联帮谷物检查中心准许真正无活虫感染.1976年前,如果在轮船上的谷物中有一定数量活虫,粮食商人就要接受三种决定:①接受盖有“受象甲感染”的最后凭证,②更换谷物;③最少在12小时内进行谷物熏蒸.所谓“受象甲感染”为每1.5公斤小麦中有一头象甲成虫(其它谷物具有不同的容许限度),象甲为米象、玉米象和谷象,以及其它在粮粒内为害的害虫如谷蠹和麦
The United States has a large number of food exports that are pest-infected from the point of production to the hands of buyers and normally permits the export of food from the United States to be allowed a true live-free infection by the United States Department of Agriculture and the United States Joint Inspection Center for Grains. Years ago, if there was a certain amount of live insects in the grain of a ship, the food trader would have to accept three kinds of decisions: (1) to accept the last document bearing the infection of Tolerance, (2) to change the grain, (3) to a minimum of 12 hours Fumigation of cereals within the so-called “by the infection of the nail” for every 1.5 kilograms of wheat, there is a bellicatum (other cereals have different tolerances), such as rice for the elephant, corn and elephants, and other Insect pests, such as grain borer and wheat, harmed in grains