2015年青岛市燕麦孢囊线虫小麦田侵染观察

摘要

In order to explore the infection characteristics of Heterodera avenae (Ha)in wheat field of Qingdao,the samples were collected site -fixedly and periodically in Chengyang and Jiaozhou sample fields. The population densities and dynamics of every Ha developmental stages were ascertained through the micro-scopic examination on nematode isolated from soil and wheat root after dyed.The results showed that in Chengyang and Jiaozhou sample fields,the emergence peaks of 2 -instar larvae of Ha occurred on April 5 and 11 respectively in soil,and the penetration peaks both occurred on April 11.The developmental peaks of 3 -instar larvae occurred both on April 18,and those of 4 -instar larvae occurred on May 9 and 17 respectively. The white females began to emerge both on May 1 and both reached the emergence peaks on May 17.The re-productive factors (Rf)of Ha both were lower,which were 0.5 and 0.9 respectively,in Chengyang and Jiaozhou sample fields.%为探讨2015年燕麦孢囊线虫（Heterodera avenae，Ha）在青岛市小麦田的侵染特点，在城阳和胶州样田进行定点和定期取样，通过土壤中线虫分离和根组织中线虫染色后镜检，测定不同时期 Ha 各虫态群体密度及其动态变化。结果表明，在城阳和胶州样田，Ha 2龄幼虫在土壤中的孵出高峰分别发生在4月5日和11日，侵入高峰均发生在4月11日；3龄幼虫发育高峰均发生在4月18日，4龄幼虫发育高峰分别发生在5月9日和17日；白色雌虫均于5月1日开始出现，均于5月17日达出现高峰。Ha 在城阳和胶州样田的繁殖系数（Rf）均较低，分别为0．5和0．9。