幼苗立枯病是世界各国比较多的病害,在日本各苗圃到处都有发生,被害的病症也是多种多样的。这种病在日本,从前发生在固定的地点是不可怀疑的。可是这种病被害不明显,还有对立枯病的研究不全,所以每年都有很多被害,林业工人对这种病逐渐有所了解。第二次世界大战后,对立枯病的试验研究也在发展,还有林业工程技术人员,对这种病的关心和认识也逐年提高了。数十年后的现 Blight seedling blight is more disease in all countries in the world, nurseries in Japan have occurred everywhere, the disease is also a variety of victims. This disease in Japan, once in a fixed place is beyond doubt. However, the disease is not obvious and there is still a lack of research on the disease. Therefore, many victims have been killed each year and forestry workers are gradually getting an understanding of the disease. After the Second World War, the experimental research on the blight is also developing, as well as forestry engineering and technical personnel, the concern and awareness of the disease also increased year by year. Decades after the present