Determination of the antifungal activity of agricultural antibiotics 702.

To explore the antifugal activity of agricultural antibiotic 702.With agricultural antibiotic 702 as the test material,and by using mould,yeast,together with 14 kinds of plant pathogenic fungi as the tested microorganism,the inhibitory action of the agricultural antibiotic 702 against all the above microorganism were investigated by the mycelial growth rate method and the hyphae dry weight method.The minimum inhibitory concentration(MIC)(mg/L) of agricultural antibiotic 702 against Aspergillus niger,Penicillium,Mucor,Rhizopus,Trichoderma,Saccharomyces cerevisiae,Candida utilis,Rhizoctonia solani,Magnaporthe grisea and Ustilaginoidea virens respectively were 3.3,6.5,6.5,3.3,3.3,6.5,3.3,23.8,13.4 and 475.4,respectively.The EC50(mg/L) and EC90(mg/L) of agricultural antibiotic 702 on the 14 tested plant pathogenic fungi were as follows:Sclerotinia sclerotiorum,0.23 and 1.95,Colletotrichum gloeosporioides,0.27 and 2.91,Plantain head blight,0.33 and 8.58,Alternaria alternate,0.89 and 12.02,Plantain sclerotiniose,1.23 and 4.02,Gibberella zeae,1.40 and 7.38,Verticillium dahliae,1.53 and 5.07,Colletotrichum sp.,1.73 and 5.61,Rhizoctonia solani,1.89 and 7.03,Gloeosporium sp.,3.21 and 14.17,Fusarium solani,3.40 and 20.78,Alternaria sp.,4.13 and 22.01,Magnaporthe grisea,12.51 and 29.36,Ustilaginoidea virens,59.42 and 201.80.Agricultural antibiotics 702 had a powerful antifungal activity,which was useful for the application of the agricultural antibiotic 702.