牧草种子的生产和流通在世界种子贸易中已占有重要地位。据统计,丹麦、美国和加拿大三大主要牧草种子生产国家年出口量均高达2万至4万吨。为了改良牧草品种,世界范围内,种质资源交流亦日趋频繁。近年来,我国各口岸牧草种子进口数量激增,急需加强对牧草种子的检疫,防止危险性病害随商品种子和引种材料传入我国。本文主要依据作者1982—1984年对加拿大、美国西 The production and circulation of forage seeds occupy an important place in the world’s seed trade. According to statistics, Denmark, the United States and Canada, the three major forage seed production countries, the annual export volume as high as 20,000 to 40,000 tons. In order to improve pasture varieties, the exchange of germplasm resources has also become more frequent in the world. In recent years, the import volume of forage seeds in our country has surged. There is an urgent need to strengthen the quarantine of forage seeds so as to prevent the introduction of dangerous diseases into our country with the introduction of commodity seeds and introduction materials. This article mainly based on the author of 1982-1984 to Canada, the United States west