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作者	单位
赵洪海，丁海燕，彭德良	（1.青岛农业大学农学与植物保护学院，山东省植物病虫害综合防控重点实验室，山东青岛 266109；2.中国农业科学院植物保护研究所，植物病虫害生物学国家重点实验室，北京 100193）

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中文摘要:

为明确山东胶州市禾谷孢囊线虫（Heterodera avenae，CCN）的田间发生状况及其年度间的差异，于2011-2012和2012-2013年两个小麦生长季在该地区麦田进行定点定期取样、土壤中线虫分离和根组织内线虫染色后镜检，以确定各虫态的季节和年度间群体动态变化。结果表明，与2011-2012年相比，2012-2013年春季CCN 2龄幼虫（J2）孵出较早，但对根系侵入较晚；土壤中J2群体密度较高，根组织中反而较低；根内幼虫发育不良，表现为3龄和4龄幼虫发生较晚且持续时间较短，没有明显发生高峰，群体密度持续低下；小麦收获后土壤中孢囊密度减少85.9%。2012-2013年J2侵入期推后和侵入率下降与3-4月份土壤干旱有关，而根内幼虫发育不良与4-5月份气温偏低有关。因此CCN侵染和发育关键期的干旱和低温可能是造成孢囊密度下降的主要原因。

英文摘要:

In order to detect the field infection process and the population dynamics of cereal cyst nematode（Heterodera avenae, CCN）in different years, and to know the relationships between them and temperature / humidity, the soil and root samples were collected periodically from a positioned wheat block in Jiaozhou city, Shandong province during the two wheat growing seasons of 2011-2012 and 2012-2013. The population densities (PD) and dynamics were ascertained through the microscopic examination of the cysts and juveniles extracted from soil and stained in roots. The results showed that the cyst PD in soil reduced by 85.9% after wheat harvesting in 2013 than in 2012. Compared with the same stage of 2012, the 2nd stage juveniles (J2) of CCN emerged into soil earlier in the spring of 2013, but they penetrated into wheat roots later, with much higher PD in soil and much lower PD in roots. The juvenile development performed abnormally in roots by the 3rd and 4th stage juveniles occurring later, lasting a shorter period of time, without obvious occurrence peak and with prolonged lower PD. By the comparative analysis between the meteorological data and CCN population dynamics, it was indicated that the soil drought condition was related to the delayed penetration and lower penetration ratio of J2 in March and April, the lower air temperatures were related to the abnormal development of the juveniles inside roots in April and May. It was inferred to be the drought and lower temperatures occurring in the critical stages of CCN invasion and development respectively that caused the obvious reduction of CCN cyst PD in 2013.

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