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引言森林不仅为人类提供木材和其它林产品,而且对保障农牧业的高产稳产,保护和美化人们的生活环境,都有重大重用。随着林业事业的发展,人们逐步改变了自然平衡,这种改变为林木病害的严重发生提供了可能,进而导致森林的经济和生态效益降低。近期我省林木病害种类由1894—1950年的56种增至500余种,主要病害每年发生面积高达80万亩,用材林仅马尾松赤落叶病为害所造成的
Foreword Forests not only provide wood and other forest products to human beings, but also have great re-use for ensuring the high and stable production of agriculture and animal husbandry and protecting and beautifying people’s living environment. With the development of forestry, people gradually changed their natural balance. This change made it possible for the serious occurrence of forest diseases, leading to the reduction of the economic and ecological benefits of forests. Recently, the species of forest trees in our province increased from 56 species in 1894-1950 to more than 500 species, and the annual occurrence of major diseases was as high as 800,000 mu. The damage caused by the deciduous masson pine in timber stands alone