HIỆU QUẢ CỦA CÁC CHỦNG VI SINH VẬT VÙNG RỄ TRONG PHÒNG TRỪ BỆNH ĐẠO ÔN Ở ĐIỀU KIỆN NHÀ LƯỚI

Biological control of plant diseases including fungal pathogens have been considered a viable alternative method to chemical control. Effective research of some biological control agents against rice blast caused by Pyricularia oryzae were studied in screen house conditions. Fourteen microbial antagonistic strains isolated from the rhizhosphere of rice fields in Mekong Delta were tested for their ability to promote plant growth and reduce the incidence of rice blast disease. Among these strains, six strains have capacity to stimulate rice growth and to prevent disease in screen house. The efficiency of reducing disease reached from 41.97 to 61.86%. Three actinomycetes isolates were attributed to Streptomyces genus, namely: Streptomyces cavourensis strain S27, S. viriabilis strain S28, S. fulvissimus strain S30 where as others belong to genera Bacillus.