【摘要】 1982～1984年研究结果,广东水稻瘤矮病毒田间的自然越冬寄主植物主要是再生稻、自生稻,带毒率分别为63.95～100%和28.57～41.20%;还新发现看麦娘(Alopecurus aequulis)是越冬寄主植物,但只个别株发病,故不重要。人工接种成功的寄主植物还有小麦(Triticum aestivum)、燕麦(Arena sativa)、野生稻(Oryza rufipogon)和玉米(Zea mays)。玉米是本研究接种成功的新寄主。稗草(Echinochloa crus—gallis)和李氏禾(Leersia hexandra)不受侵染。在自然情况下,迄未发现越冬的小麦和野生稻有感染此病的。本病毒的介体昆虫最主要的是电光叶蝉(Recilia dorsalis Motsch.),而黑尾叶蝉(Nephotettix cincticeps Uhler.)和二点黑尾叶蝉(N.virescence Dis-tant.)的作用很小。整个冬、春田间只发现电光叶蝉有保毒虫,并能终生传毒,但卵不保毒。叶蝉在广东病区冬季仍繁殖1～2代,但若虫在感病再生稻及自生稻上可再获毒和保毒。电光叶蝉带毒率在1月份为5.06～15.38%,2月份下降为0～3.13%,3月份插秧前后上升至15.81～16.41%,可见电光叶蝉也是瘤矮病毒的重要越冬初侵染源。更多还原

【Abstract】 Investigations carried out in 1982-1984 revealed that in the epidemicregions the rice ratoon and the volunteer rice plants were the most im-portant overwintering host plants of the rice gall dwarf virus with diseaseincidence of 63.95-100% and 28.57-41.20% respectively.Alopecurus aequa-lis was found to be a new overwintering host plant,but it was found tobe infected naturally only once,so it was probably not too important.The host range of the virus was further demonstrated by artificialinoculation method to include Triticum aestivum,Avena sativa,Oryza ru-fipogon and Zea mays.Among them T.aestivum was widely grown and O.rufipogon could be found in the diseased area all through the winter,butnone of them was ever found naturally infected.The most important insect vector of the virus found in the epidemicarea was Recilia dorsalis Motsch,Nephotettix cinticeps Uhler and N.vires-cence Distant were of no practical significance.The virus was persistentin these insect vectors,but preliminary experiment with R.dorsalis showedthat the virus was not transovarial.These insects could multiply 1-2 generations in the winter season in the epidemic area,and the nymphscould acquire the virus easily since there were abundant infected hostplants.The results of investigations showed that the rates of infested R.dorsalis nymphs and adults in the epidemic localities were 5.06-15.38% inJanuary,1983,reduced to 0-3.13% in February,and rose up to 15.81—16.41% in March.The result proved that the R.dorsalis was also an im-portant overwintering host of the rice gall dwarf virus in the west ofGuangdong.更多还原