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| The Primary Studies on Pathogen Identification and Biological Characteristics of Physalis Alkekengi L. Root Rot in Yilan County of Heilongjiang Province |
| WANG Yong，ZHANG Jing-jing，YE Yang-yang，CHEN Dian* |
| College of Horticulture，Northeast Agricultural University，Harbin 150030，Heilongjiang，China |
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Abstract The separate identification of pathogens from the disease tissue of Physalis alkekengi L. root rot in Yilan county of Heilongjiang province was carried out in this report．he morphology observation and the results of rDNA ITS sequence analysis revealed that Fusarium solani （Mart.）Sacc. and Fusarium oxysporum Schlecht. were the main pathogenic bacterias．The optimum field temperature was 25-30 ℃，and the most suitable pH value was 8.0 for the F. solani colonies growth. The F. oxysporum could grow with temperature between 10-30 ℃，while 25 ℃ and pH 7.0 is the optimum condition. Light had no significant effect on both main pathogenic bacteria.
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Received: 12 April 2011
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