The present invention refers to the strainStreptomyces melanosporofaciensAGL225 identified in the Spanish Type Culture Collection (CECT) asStreptomyces melanosporofaciensCECT9420, and the use of said strain as a pesticide in plants. Further aspects of the invention relate to suspensions and extracts of strainS. melanosporofaciensAGL225 and methods of preparing the same. Additional aspects relate to pesticidal compositions comprising S.melanosporofaciensAGL225. Finally the invention relates to a method for biological control of plant pests comprising administering to the plant strain S.melanosporofaciensAGL225 , a composition including said strain or a cell-free extract derived from S.melanosporofaciensAGL225.本發明係關於在西班牙典型培養物保存中心(CECT)中鑑別為生黑孢鏈黴菌CECT9420之菌株生黑孢鏈黴菌AGL225、及該菌株作為植物殺有害生物劑之用途。本發明之其他方面係關於菌株生黑孢鏈黴菌AGL225之懸浮液及萃取物及其等之製備方法。另外的方面係關於包含生黑孢鏈黴菌AGL225之殺有害生物組成物。最終,本發明係關於用於生物控制植物有害生物之方法,其包含向該植物投予菌株生黑孢鏈黴菌AGL225、包含該菌株之組成物或自生黑孢鏈黴菌AGL225衍生之無細胞萃取物。