Abstract:

To identify pathogenic pathogen categories of soybean root rot and screen germplasm resistance in Heilongjiang Province, we separated Fusarium oxysporum, Rhizoctonia solani and Pythium debaryanum using PDA culture medium from soybean root rot plants collecting from 100 sites of soybean production areas in Heilongjiang from 2008, and Phytophthora sojae was separated by selective medium. The separation results indicated that, the occurrence frequency of major pathogenic bacterium was, Fusarium oxysporum occupied 42.7%, Pythium debaryanum 25.5%, Rhizoctonia solani 7% and Phytophthora sojae 25.2%. Our results showed that, after identifying 1249 portions of soybean materials infected under natural invasion condition, disease index of 471 portions were under 15%, occupied 37.7% of identified materials. Fusarium oxysporum was more frequent than others in artificial vaccination to 471 portions materials, in which disease index of 69 portions was under 15% and occupied 14.6% of test materials. From our results, we draw the conclusions that, we identified pathogenic pathogen categories of soybean root rot and there were materials resistant to root rot in soybean cultivars and resources.