田间禾本科杂草对水稻条纹病毒流行风险评估调查

Risk Assessment of Gramineae Weeds for Rice Stripe Virus Epidemic in the Field

采用室内灰飞虱接种鉴定的方法评价了江苏地区主要杂草对水稻条纹病毒(rice stripe virus,简称RSV)的感染率。结果显示,看麦娘、稗、旱稗、狗尾草、升马唐的感染率较高,为38.24%~62.00%,具有成为RSV“桥梁”寄主的可能性。对病害大流行年份(2005年)江苏主要杂草种类RSV感染率田间调查工作进行总结,发现野生禾本科杂草中存在RSV感染,但其感染率低于同期小麦植株的感染率,这说明小麦是RSV侵染循环中重要的“桥梁”寄主。于病害不流行年份(2018—2019年)在江苏多地采集田边稗草和狗尾草,经分子生物学检测,可检测出RSV。禾本科杂草对病害流行的贡献度低于小麦,其在病害侵染循环中的作用主要体现在维持RSV在农田生态系统中的存在。

The infection rate of rice stripe virus(RSV)to main weeds in Jiangsu Province was evaluated using Laodelphax striatellus for inoculation in laboratory.Alopecurus aequalis,Echinochloa crusgalli,E.hispidula,Setaria viridis and Digitaria ciliaris could serve as“bridge”hosts of RSV.Their infection rates were between 38%and 62%.RSV infection rate to main weed species in fields in Jiangsu Province during the epidemic year(2005)was summarized.RSV infection existed in wild Gramineae weeds,but its infection rate was lower than that in wheat plants at the same time.It suggested that wheat was an important“bridge”host in RSV infection cycle.RSV was detected in E.crusgalli and S.viridis collected from many locations in Jiangsu Province when the disease was not prevalent(2018—2019).The contribution of Gramineae weeds to the disease epidemic was lower than that of wheat,and their role in the disease infection cycle was mainly reflected in maintaining the existence of RSV in the farmland ecosystem.