中国农科院原子能利用研究所微生物室等四单位,自1963年起,于筛选内吸抗菌素过程中获得一株No.23-16放线菌,及其代谢产物——多效霉素(M)。菌株经过分离培养,以及形态特征、培养特性和生理生化的测定,并与近似菌株作了系统比较,确定No.23-16为放线菌的一个新变种,定名为不吸水链霉菌白灰变种(Streptomyces ahygroscopi-cus var.incanus n.var)。利用多效霉素(M)的混合浓缩液或膏剂、粉剂防治橡胶树割面条溃疡病的效果达80～100％,类似“溃疡净”,而优于放线酮和敌菌丹农药。同时,对 China Academy of Agricultural Sciences Atomic Energy Research Institute of Microbiology Room and other four units, from 1963 onwards, in the process of screening antibiotics to obtain a No. Actinomycetes No. 23-16, and its metabolites - multivitamin (M ). The strains were isolated and cultured, as well as morphological characteristics, culture characteristics and physiological and biochemical determination, and compared with the similar strains were made to determine No.23-16 actinomycetes a new variant, named as non-absorbent Streptomyces white ash variant Streptomyces ahygroscopi-cus var. Incanus n.var). The effect of the powder on the control of rubber tree cut noodles ulcer disease is 80-100%, which is similar to that of “ulcer net”, but better than that of linearisone and dactinomycetes. At the same time, right