Biological Control of Severe Fungal Phytopathogens by Streptomyces albidoflavus Strain CARA17 and Its Bioactive Crude Extracts on Lettuce Plants

Lettuce crop is an important horticultural of several Mediterranean countries, including Italy. The Italian region which a major producer lettuce crops Apulia, where this cultivated in open fields greenhouses. Since microbial pathogens are responsible for diseases found on produced greenhouses, study, the experimental activities focused most severe fungal soilborne pathogens, i.e., Sclerotinia sclerotiorum and Athelia rolfsii. Their control often performed with fungicides cause public concern over environment human health. main aims study were to determine biocontrol efficacy Streptomyces strain vitro vivo conditions seedlings against rolfsii as through application its vegetative propagules putative bioactive crude extracts via filtrate culture. results obtained confirm significant effectiveness CARA17 severity both during two different experiments: when it used culture containing metabolites conditions. These preliminary demonstrated that actinomycetes valid agent (BCA) phytopathogens study. action from clearly mainly due produced, but further studies necessary identify (polyphenols, terpenes, fatty acids, etc.) strain.