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油松苗期主要病害有猝倒病和立枯病,主要危害油松幼苗茎基部,以造成油松死苗,严重影响油松幼苗的生长,为防治这两种幼苗病害,笔者通过对这两种病害防治实践,现将油松苗期主要病害的发生与防治总结如后。1症状1.1猝倒病。幼苗茎基部受害,病部水浸状软腐半缢缩成线。病菌致幼苗成片倒伏,在病苗及附近土壤表面可见棉絮状物。1.2立枯病。多危害较大幼苗茎基部,幼苗出土后,茎基部尚未充分木质化前,在茎基部出现褐色长形病
Pinellock seedling stage main disease damping-off disease and damping-off disease, the main hazard to the stem base of Pinus tabulaeformis seedlings in order to cause Pinus tabulaeformis seedlings seriously affect the growth of Pinus tabulaeformis seedlings in order to prevent these two seedling diseases, the author passed these two Seed disease prevention and control practices, now the main diseases of pine seedlings at the occurrence and prevention of the disease as summarized. 1 symptoms 1.1 damping off disease. Stem base of seedlings victims, sickly flooded soft rotten halves shrink into lines. Pathogen caused by seedlings lodging film, in the vicinity of the soil and seedlings visible cotton-like material. 1.2 Blight. More endanger the larger base of the seedlings, seedlings unearthed after the stem base has not yet fully lignified before the brown stalk at the base of the stem