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加拿大的苜蓿种植业起始于本世纪初,苜蓿种子生产主要集中在加拿大的中西部地区。在加拿大苜蓿不仅作为一种高蛋白饲料大面积种植,而且还被用来与其它作物轮作,以改良土壤和防止水土流失。加拿大每年都需要数千吨的优良苜蓿种子,使苜蓿种子生产很快发展起来,并以其高产、稳产和优质而著称。纵观历史,加拿大的苜蓿种子生产经历了一个曲折的发展过程,而在这一过程中,苜蓿切叶蜂做出了突出的贡献。加拿大于1908年从美国明尼苏达州引进了苜蓿种子并开始在西部地区进行种植和繁种。30年代中期以后,加拿大苜蓿生产曾经历了一段迅速发展的时期,全国的苜蓿种植面积从1935年的1.04万公
Canada’s alfalfa farming started in the beginning of this century, alfalfa seed production is mainly concentrated in the Midwest of Canada. In Canada, alfalfa is not only grown on a large area as a high-protein feed, but also used to rotate with other crops to improve the soil and prevent soil erosion. Every year thousands of tons of good alfalfa seeds are needed in Canada and alfalfa seed production develops rapidly and is known for its high yield, stable yield and good quality. Throughout history, alfalfa seed production in Canada has undergone a tortuous course of development, and alfalfa sawfly has made outstanding contributions during this process. Canada brought alfalfa seeds from Minnesota in 1908 and began planting and breeding in the western region. After the mid-1930s, Canada’s alfalfa production experienced a period of rapid development, the national alfalfa acreage from 1935 to 10400