棉红腐病病原菌的研究

STUDIES ON THE PATHOGENS OF FUSARIUM RED ROT OF COTTON

自1978至1990年采集标本194份;分离得菌株200个,鉴定为下列6种镰刀菌:Fusariummoriliforme var.intermedium Neish & Leggett (61%),F.semitectum Berk。&Ray.(28%),F.oxysporum Schl.(4%),F.solani(mart).Sacc.(3.5%),F.equi-seti Sate.(3%),F.camptoceras Wollenw.& Reink.(0.5%).

194 Seedlings and bolls showing symptoms of red rot of cotton werecollected during 1978-1990.200 strains from these specimens were isolated.Based on morphological and cultural characters,these strains were identifi-ed to be Fusarium moniliforme var.intermedium Neish & Leggett(61% inhighest per cent),F.semitectum(28%),F.oxysporum(4%),F.solani(3.5%),F.equiseti(3%),F.camptoceras(0.5%). Inoculation tests demonstrated that F.moniliforme var.intermedium wasthe predominant pathogen causing seedling and boll red rot of cotton.Hostrange tests of F.moniliforme var.intermedium showed variation in degreeof pathogenicity on rose of sharon,jute,broad bean,mung bean,pea,eggplant,tomato,hot pepper,water melon,towel gourd,rape,radish,corn,barley andrice,and also their effect on the elongation of the rice seedlings.