Pesticidally active substantially pure nikkomicin fractions obtained from Streptomyces tendae Ettlinger et al Tu 901, the fractions being selected from the group consisting of ##STR1## a mixture of nikkomicin I and J, and a mixture of nikkomicin M and N.
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STreptomyces tendae Ettlinger et al Tu 901获得的具有杀虫活性的纯度显著的尼科霉素分离物,所述分离物选自以下组合:##
STR1## 尼科霉素I和J的混合物,以及尼科霉素M和N的混合物。