1989年我们在阿尔山林业局进行病害调查时,在樟子松人工林中个别树木上发现一种国内尚未报道的新病害——壳针孢叶枯病。 该病多发生在树冠下部针叶上和针丛的中部或下部。发病初产生退绿斑点,逐渐变成黄褐色,后期病部以上部位枯黄死亡,提前落叶。 In 1989, when we carried out disease investigation in Aershan Forestry Bureau, we found a new disease that has not yet been reported in China - Septoria leaf blight on individual trees in Pinus sylvestris plantation. The disease occurred in the lower part of the canopy and needle plexus in the middle or lower part. Early onset retreat green spots, gradually turned into brown, the latter part of the disease above the dead yellow part of the leaves in advance.