To study the biological activities of symbiotic and epiphytic microorganisms 38 strains of the symbiotic and epiphytic microorganisms were isolated from 7 different red algae collected from the intertidal zone of qingdao,weihai,yantai.Four kinds of solvents were used to extract the orange peel,and the anti-fugal activity of different extracts were tested with 7 fungi i.e.Rhizoctonia solani,Valsa mali,Pythium aphanidermatum,Gibberella zeae,Fusarium oxysporum,Botrytis cinerea and Alternaria alternata at 0.005...