Abstract
Soil microbes can act as biological agents to control pathogens, for example Streptomyces sp. which has known to produce secondary metabolites in the form of antibiotics that can inhibit the growth of several pathogenic fungi. If Streptomyces sp. sprayed to peanut leaves, it reduced the severity of disease of Gajah, Garuda, Kancil and Hypoma 1 varieties, which indicated by a high disease suppression with efficacy value more than 50%. Streptomyces sp. also inhibited 0.42% Fusarium oxysporum growth (moler pathogen) in vitro. However, in vivo assay, it did not suppress the development of moler disease which indicated by the high value of severity and infection rate, also low efficacy of disease suppression. So, this was an example that Streptomyces sp. was effective for controlling Cercospora leaf spot disease in peanut, but not effective to control moler disease in shallots.
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