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我们曾从党参根腐病两种类型的典型病株上分离获得3个菌株:P_1、P_2、P_3。经用它们的单孢后代进行回接和再分离的初步试验,排除了分离频率低且回接显症不明显的P_2。本文用分离频率高的P_1和P_3两个菌株,对党参致病性进行测定,并对病原的生物学特性进行了观察。 一、分离菌P_1和P_3对党参的致病性测定 1、对新鲜参根的侵染 将健康的新鲜参根洗净,切成1～2厘米的小段,用6%
We have isolated from the two types of typical strains of Codonopsis the three strains: P_1, P_2, P_3. Initial experiments with backcrossing and re-isolation of their single spore progeny excluded P 2 with low frequency of sequestration and poorly palpated backings. In this paper, two strains P_1 and P_3 with high frequency of separation were used to determine the pathogenicity of Codonopsis pilosula and the biological characteristics of the pathogen were observed. First, the isolates P_1 and P_3 on the pathogenicity of Codonopsis Determination 1, the infection of fresh roots will be healthy fresh root washing, cut into small pieces of 1 to 2 cm, with 6%