Effect of carbon sources on the production of the biofungicide by Streptomyces hygroscopicus.

Fungi from the genera Alternaria, Colletotrichum and Fusarium are listed among the most important storage pathogens of apple fruits. Isolate of Alternaria sp. was obtained from apple fruit samples expressing rot symptoms. Biological control of plant pathogens by means of microorganisms is considered as an attractive alternative to chemicalbased treatments, with minimal impact on the environment. Actinomycetes are known to have a great potential for control of plant fungal diseases and their antifungal activity greatly depends on the medium