黑龙江省大豆疫霉根腐病调查与病原分离

Investigations and pathogen isolation of phytophthora root rot of soybean in Heilongjiang Province

１９９６年对黑龙江省东部和中部大豆产区２３个市、县的大豆苗期疫霉根腐病进行了调查、研究，应用ＰＢＮＩＣ疫霉选择性培养基分离大豆疫霉根腐病病原菌，从牡丹江、穆棱、林口和佳木斯豆田具疫霉根腐症状的大豆植株上分离到大豆疫霉根腐病菌，并从根腐病株上单独或与大豆疫霉菌同时分离到终极腐霉菌，研究进一步证实我国黑龙江省有大豆疫霉根腐病。调查发现，大豆疫霉根腐病和终极腐霉根腐病主要发生在土质粘重、土壤含水量高或易积水的田块。

In 1996, a survey of phytophthora root rot of soybean was made in the east and middle parts of Heilongjiang. The phytophthora-selected medium, PBNIC, was used for isolating the causal agent in the fields. Some isolates of Phytophthora sojae were obtained from soybean plant with typical root and stem rot symptoms in soybean fields in Mudanjiang, Muling, Linkou and Jiamusi. The isolation results also showed that the phytophthora root rot disease was present in Heilongjiang. Another important fungus, Pythium ultimum, was also isolated with P. sojae or alone from plants with the symptoms. Plants with phytophthora and pythium root rot occurred mainly in clay or silt loam fields flooded or with high soil moisture.