Hiệu quả phòng trị của một số nhóm hoạt chất kháng sinh và hóa học đối với vi khuẩn Ralstonia solanacearum gây bệnh héo xanh trên cây hoa vạn thọ (Tagetes papula L.)

Abstract

The effectiveness of three antibiotic and chemical compounds in controlling wilt disease caused by Ralstonia solanacearum from Tagetes papula L. in vitro and in net-house conditions are evaluated. In vitro, these compounds were tested on 10 strains of R. solanacearum to find bacterial inhibit effect at 72 hours after inoculation. From there, the compound of Streptomycin + Oxytetracycline is higher effect in inhibitting R. solanacearum strains than the other two compounds as Oxytetracyline hydrochloride + Gentamicin sulphate, or Oxolinic acid. Under net-house condition, the compound of Streptomycin + Oxytetracycline and two strains of R. solanacearum RM3 and RM4 with the least sensitive characteristic to this compound are tested to evaluating the effectiveness of disease controlling on marigold plants. Through 6, 10, 14, 18 days after infection, both treatments infected with separate strains of RM3 or RM4 after applied the Streptomycin + Oxytetracycline compound have showed satisfactory effect. The effectiveness of reducing bacterial wilt disease is high with ranging from 46.7% to 57.2%. At the same time, when the results of appling are compared with the treatments that only infected with RM3 or RM4, their AUDPC index are also decreased. In addition, their severity index are reduced while they compared with treatments that only infecting with RM3 or RM4. The compound of Streptomycin + Oxytetracycline has shown effective disease reduction in the prevention and treatment of bacterial wilt caused by R. solanacearum on marigold, and it can be selected as one of the preventive measures this disease.