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近年来资本主义国家的烟草生产,由于农业劳力紧张,工商业对质量的迫切要求和吸烟与卫生以及农药残毒问题的提出等因素的促进,在科技方面有较快的发展。(一)品种的培育和管理新品种培育方向由优质高产抗病等目标向对多种主要病害具有综合抗性和加强已获得的抗病性发展。各类型都有新品种陆续育成推广(附表13)。局部的情况如霜霉病继续产生为害严重的变种,致使一些抗病品种失效,促使这一区域的育种工作在国际合作的范围
In recent years, the production of tobacco in capitalist countries has enjoyed rapid development in science and technology due to such factors as the shortage of agricultural labor, the urgent demands of the commercial and industrial sectors for quality, the promotion of smoking and sanitation, and the issue of residues of pesticides. (A) Cultivation and Management of Varieties The cultivation direction of new varieties is characterized by high quality, high yield, disease resistance and other objectives, and comprehensive resistance to various major diseases and enhancement of disease resistance development. Various types of new varieties have been bred to promote (Schedule 13). Local conditions, such as downy mildew, continue to produce highly devastating varieties that have rendered some resistant varieties ineffective and have contributed to breeding in the region in the context of international cooperation