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本世纪初,荷兰榆病和板栗萎凋病传到美国,造成了无数美国榆和美国板栗的死亡。数十年来,树木学家、病理学家、遗传学家通过多种途径,已经探索到致命的病原。不过对美国板栗来说,问题的解决还是可望而不可及,板栗萎凋病的防治仍在探索中(见本刊1982年第1期《美国板栗萎凋病之谜》)。关于榆树的情况就好得多了。新培育的抗性榆树,完全有希望象过去那样,可以生存几百年。
At the beginning of this century, the Netherlands elm disease and chestnut withered disease spread to the United States, resulting in numerous death of American elm and American chestnut. For decades, treeologists, pathologists, and geneticists have explored deadly pathogens through a variety of pathways. However, for the American chestnut, the solution to the problem is still beyond the reach. The prevention and control of chestnut withered withering disease is still under investigation (see issue 1, 1982, “The Mystery of American Withered Withers”). The situation with elms is much better. The newly cultivated elm tree is hopefully hopeful for hundreds of years, as it used to be.