2008年10月至2009年6月,系统调查了田间小麦根组织和根围土壤中小麦根腐线虫群体密度随季节的变化规律,并研究其发生对小麦产量的影响.调查发现,小麦根腐线虫群体数量在郑麦004和豫麦70号的根组织中都出现了2个高峰期,分别是2008年12月1日(每克根组织中1535条、290条)和2009年5月1日(每克根组织中2180条、270条).郑麦004根围土壤中的小麦根腐线虫数量在2008年12月1日和2009年6月1日出现2个高峰期,分别为每100 g土15.8条、18.9条;而豫麦70号根围土壤中的小麦根腐线虫数量在2008年11月15日和2009年6月1日出现2个高峰期,分别达到每100g土11.2条、23.6条.铁灭克处理土壤能够显著减少侵入小麦根组织内根腐线虫的数量,增加小麦的穗粒数和千粒重,从而提高小麦的产量(增产13.6%).其中,乳熟期的小麦线虫发生量与小麦产量之间的相关性最强,相关系数为-0.902.%In this study the group density of wheat root lesion nematode in both root tissue and rhizosphere soil was investigated throughout wheat growth period,and impact of wheat root lesion nematode on wheat yield was also researched. It was found that wheat root lesion nematode in root tissue of Zhengmai 004 and Yumai 70 displayed two quantity peaks,which were 1535 and 290 per gram root tissue on 12/15/2008,and 2180 and 270 on 5/1/2009, respectively. The nematode in Zhengrnai 004 rhizosphere soil displayed two quantity peaks,which were 15.8 on 12/1/2008 and 18. 9 on 6/1/2009 for every 100 grams of soil,while for Yumai 70 the peaks occurred on 11/15/2008 and 6/1/2009,which were 11.2 and 23.6 for every 100 grams of soil,respectively. Furthermore,temik treatment of BW6 reduced the group density of wheat root lesion nematode in wheat root tissue, thereby increasing wheat spike number, thousand seed weight and wheat yield. The number of wheat nematode at milky stage showed strongest correlation with wheat output,with correlation coefficient of -0. 902.
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