The control efficacies of antagonistic bacteria against Fusarium oxysporum f.sp.cubense in banana

Four antagonistic strains isolated from the soil of orchards were tested for their inhibitive activity and control efficacy against Fusarium oxysporum f.sp.cubense.The results showed that,five days after incubation of the antagonistic strains(bio-d4,bio-d5,bio-B3 and bio-p) with the pathogen in the dual test on PDA plates,inhibitive zones with 16.5～20.5 mm width were formed,their inhibitive efficacies maintained stable for 10 days after incubation.Antagonistic strains bio-d4,bio-d5,bio-B3 and bio-p,can significantly inhibit conidial germination of the pathogen,inhibitive rates reaching to 90.49%～97.18%.The control efficacies of 100,200,300-fold diluted fermatation solution of antagonistic strains bio-d4,bio-d5,bio-B3 and bio-p were from 53.3% to 80.2%,being significantly stronger than the efficacies of antagonistic strain bio-p and hymexazol.