【摘要】 1997～ 1 999年 ,从长绒棉区采集 1 80个病株 ,分离获得 84个棉花枯萎病菌菌系 ,选出具有代表性的 1 9个菌株作 , 型鉴定。结果表明 ,供试 1 9个菌系均高度侵染海岛棉 ,高度或轻度侵染陆地棉 ,不侵染中棉 ,均属于生理 型 7号生理小种 ,尚未发现生理 型菌系。根据在 6个鉴别寄主上的致病性反应 ,可将长绒棉区供试菌系划分为强、中、弱 3种类型 ,主要为弱致病型 ,占供试菌系的 47.4%。大分生孢子大小为 ( 1 3.7～ 2 3.6) μm× ( 2 .7～5.4)μm,多为马特型 ,菌丝白色 ,菌落底部紫色或浅紫色 ,部分菌系易产生粘分生孢子团更多还原

【Abstract】 In 1997-1999,19 representative strains from 84 isolates of pathongens of cotton Fusarium wilt in long fibre cotton area are identified.The result shows that Gossypium barbadense varieties are infested severely, G.Hirsutum are infested lightly,and G.Herbaceum arent infested absolutely by 19 strains.These strains are identified as biotype Ⅱ and the reason is related to the change of agricultural culture system.The pathogenicity type of these strains is mainly weak one.The size of macroconidia of Fusarium pathogenes in this cotton area is (13.7-23.6)×(2.7-5.4) μm,the hyphae is mainly white,pigment at bottom is purple or light purple,HAI 17 strain is easy to produce pinnotes.更多还原