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.)

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Tác giả: Ngọc Tâm Huỳnh, Uyển Thanh Lê, Lan Phương Tô

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học Đại học Đồng Tháp: Khoa học Tự nhiên, 2022

Mô tả vật lý: tr.80-87

Bộ sưu tập: Metadata

ID: 330173

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Hiệu quả kiểm soát của ba nhóm hoạt chất kháng sinh và hóa học đối với các dòng R. solanacearum gây bệnh héo xanh trên cây hoa Vạn thọ được đánh giá trong điều kiện in vitro và nhà lưới. Thử nghiệm in vitro trên 10 dòng R. solanacearum sau 72 giờ, kết quả cho thấy nhóm hoạt chất Streptomycin + Oxytetracyline có tác dụng ức chế cao đối với mầm bệnh so với hai nhóm còn lại là Oxytetracyline hydrochloride + Gentamicin sulphate, và Oxolinic acid. Sau đó, nhóm Streptomycin + Oxytetracyline và hai dòng R. solanacearum RM3 và RM4 với đặc điểm ít nhạy cảm nhất với nhóm hoạt chất này được thử nghiệm đánh giá hiệu quả kiểm soát bệnh trong điều kiện nhà lưới. Ở các thời điểm 6, 10, 14, 18 ngày sau khi lây nhiễm bệnh, cả hai nghiệm thức có xử lý nhóm hoạt chất Streptomycin + Oxytetracyline kết hợp lây nhiễm bệnh riêng biệt với RM3 hoặc RM4, đều ghi nhận đạt hiệu quả giảm bệnh tương đối cao, dao động từ 46,7% đến 57,2%. Đồng thời, chỉ số tích lũy bệnh theo thời gian (AUDPC) cũng giảm so với các nghiệm thức chỉ lây nhiễm bệnh với dòng RM3 hoặc RM4. Bên cạnh đó, chỉ số bệnh được ghi nhận giảm so với các nghiệm thức chỉ lây nhiễm bệnh với dòng RM3 hoặc RM4. Nhìn chung, nhóm hoạt chất Streptomycin + Oxytetracyline đã thể hiện được hiệu quả giảm bệnh trong phòng trị bệnh héo xanh do R. solanacearum gây ra trên cây hoa Vạn thọ, và có thể được lựa chọn như một trong những biện pháp phòng trị bệnh này.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 inhibiting effect at 72 hours after inoculation. From there, the compound of Streptomycin + Oxytetracycline has 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 evaluate 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 ranging from 46.7% to 57.2%. At the same time, when these results are compared with the treatments that only infected with RM3 or RM4, their AUDPC index is also decreased. In addition, their severity index is reduced while they compared with treatments only infected 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.

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