落叶松早期落叶病(MycosPhaerella LarieinaRmatig)在草河口人工落叶松林中发生,颇为严重.对落叶松人工林有极大的威胁。根据我们的调查,本病的发生与树种、下木多少、混交情况等有密切的关系,日本落叶松较能抗病,长白落叶松则发病较重,混交林和下木多的林分发病较轻。本病在我国落叶松林区虽早有发生,但发生的原 Larch deciduous disease (MycosPhaerella LarieinaRmatig) in the artificial estuary artificial larch forest occurs quite serious, the Larch plantation has a great threat. According to our investigation, the occurrence of this disease is closely related to the species of tree, the amount of understory wood, the mixed situation, etc., the Japanese larch is more resistant to disease and the Larix olgensis is more severe, the mixed forest and understorey are more affected Lighter. The disease in our country larch forest area has long occurred, but the occurrence of the original