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油松幼苗立枯病又称幼苗猝倒病,在我省各地苗圃中发生普遍,危害严重。主要危害油松、落叶松、杉树等针叶树幼苗,在短期内引起苗木大量死亡。有些阔叶松幼苗也能受害,还可危害许多农作物。一、油松立枯病的发生类型苗木得病后,伏倒而枯死者称为猝倒病;枯死而不倒者称为立枯病。这是因为幼苗发病的时期不同,出现不同的症状。其症状一般可分为四种类型:1、种芽腐烂。播种后,籽粒吸水膨胀,幼芽萌发,出土前,若土壤潮湿板结,种苗在土中被病菌
Pine seedling blight, also known as seedling damping-off disease, occurs in nurseries around the province common, serious harm. Major hazards pine, larch, fir and other conifer seedlings, seedlings caused a large number of deaths in the short term. Some of the broadleaf pine seedlings can also suffer, but also can endanger many crops. First, the incidence of oil palm damping-off disease seedling disease, the collapse and dead were called damping-off disease; wither rather than down who called blight. This is because the different stages of emergence of seedlings, the emergence of different symptoms. The symptoms can generally be divided into four types: 1, the bud rot. Sowing, the grain water swelling, sprouting buds, before the unearthed, if the soil moisture board, seedlings in the soil by bacteria