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云杉(Picea asperata Mast.)分布于四川的岷江、大小金川和白龙江流域,延伸到青海东部,甘肃南部和陕西西南部.处大江大河上游,对森林的水源涵养、水土保持、稳定流量等均具有重要作用.也是高山林区主要用材树种之一.近年来云杉受到30多种病虫害为害,其中主要病害为云杉赤落叶病(Hypoderma sp.).云杉赤落叶病分布范围广,危害严重,造成经济损失很大.在四川阿坝州、凉山州、甘孜州的马尔康、松潘、黑水、金川、木里、丹巴、壤塘均有分布.林木受害株率高达100%,感病指数高达81.8,平均每公顷损失木材幼龄林为5.9833—9.6069米~3.主要危害粗枝云杉
The spruce (Picea asperata Mast.) Is distributed in the Minjiang River, Jinchuan and Bailongjiang basins in Sichuan Province and extends to the east of Qinghai, southern Gansu and southwestern Shaanxi. The upper reaches of the Dajiang River lead to water conservation, soil and water conservation, steady flow, etc. It is also one of the main timber species in the mountainous forest area.In recent years, the spruce has been affected by more than 30 pests and diseases, of which the main disease is Hypoderma sp. Serious, resulting in great economic losses in Sichuan Aba, Liangshan Prefecture, Ganzi Prefecture Malcolm, Songpan, black water, Jinchuan, Muli, Danba, soil ponds are distributed.Forest strain of affected trees up to 100%, susceptible The index is as high as 81.8, with an average loss of lumber per hectare of 5.9833-9.6069 m ~ 3. The main hazard is the spruce