徐州贾汪地区银杏幼苗死亡原因分析

Analysis on reason of Ginkgo biloba seedlings died in Xuzhou Jiawang

调查研究结果认定立枯病是造成银杏幼苗死亡的主要原因，土壤水淹涝渍是诱发该病发生的环境条件，水泥粉尘污染削弱了幼苗对病害的抗御能力，在一定程度上加重了立枯病的危害。

There were numbers of Ginkgo biloba seedlings died in Xuzhou.After investigating,a conclusion could be drawn that damping off disease,which initiated by two different pathogens, Macrophmina and Rhizoctonia ,was the main reason to the death event.After all,high level of soil moisture has contributed to forming suitable environmental condition for this disease,while cement powder has wakened seedlings resistant ability and aggravated the injury at a certain extent. Author’s address:Institute of Botany,Jiangsu Province and Chinese Academy of Sciences,Jiangsu Nanjing 210014 China