Control efficacies of antagonistic bacteria against chieh-qua Fusarium wilt

The antagonistic bacteria strain bio-d4 was tested for its inhibitive efficacies and control efficacy against Fusarium oxysporum Schl.f.sp.benincasae.The results showed that,five days after incubation of the antagonistic strain bio-d4 in 100-,200-,300-fold dilution with the pathogen in the dual test on PDA plates.Inhibitive zones with 9.0～11.8mm width were formed,their inhibitive efficacies maintained stable 10 days after incubation.Antagonistic strain bio-d4 Ferment solution,and with50-,100-fold,can significantly inhibit conidial germination of the pathogen,inhibitive rates getting to 7.7%～76.4%;seven days after application of bio-d4 with 100-fold and 200-fold diluted fermentation solution,the control efficacies are between 51.3%~59.4%,which are significantly stronger than that of its 300-fold diluted fermentation solution other treatments and hymexazol.