青海省春小麦禾谷孢囊线虫病侵染规律研究

Infection dynamics of Heterodera avenae on spring wheat in Qinghai province

采用袋装苗定点观察和田间系统调查相结合的方法,调查研究了青海省春小麦禾谷孢囊线虫病的侵染时期、发育进度、发生动态及发生世代。结果表明,自4月份气温回升,土壤中的越冬孢囊孵化出2龄幼虫,侵染苗期小麦根系,4月下旬至7月上旬幼虫在根内完成2龄至4龄3个虫态的发育,7月份白色雌成虫裸露在根系表面,8月至9月初新孢囊脱落到土壤中,10月中旬至翌年4月上旬以孢囊在土壤中越冬,整个春小麦生育期小麦禾谷孢囊线虫发生一代。

The infection period,development progress,dynamics and generation of Heterodera avenae on spring wheat in Qinghai province was investigated by seedling observation combined by field work.The results show that 2 instar larvae hatched out of the overwintering cyst in soil infected the wheat seedling roots by the rise of temperature since the middle of April.The larvae Completed three stages from two age to four age in wheat root late April to early July and the white female adults exposed on the root surface in July.From August to September the new cyst folled into the soil,and the wintering period is from the middle of October to next April.Heterodera avenae occurs one generation during the whole growth period of spring wheat.