落叶松早期落叶病(下称早落病),在我场从1962年就已发现,随着造林面积的增加,病害发生面积也不断扩大。到1973年止,全场落叶松人工林早落病发生面积已达8.6万亩以上,占全场落叶松人工林总面积的21.6％,其中病害较严重的面积已达四万多亩,分布在各个分场。这种病害对林木生长的影响非常严重,是我国北方落叶松人工林的主要病害之一。为此,我场党委于1973年组织有关人员对全场病情进行一次大普 Larch early deciduous disease (hereinafter referred to as early bird disease), in our field since 1962, we have found that with the increase of afforestation area, the disease area has also expanded. By 1973, the total area of ​​larch plantations had reached 86,000 mu, accounting for 21.6% of the total larch plantation area, of which more serious diseases had reached more than 40,000 mu In each sub-field. This disease has a very serious impact on the growth of trees and is one of the major diseases in the Larix principis-rupprechtii plantation in China. To this end, my party party committee organized in 1973 the staff on the audience a big situation