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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
From 1997 to 1999, a total of 180 diseased plants were collected from the long-staple cotton area and 84 Fusarium oxysporum f. Sp. Isolates were obtained. A total of 19 representative isolates were selected for identification. The results showed that all the 19 bacterial strains tested were highly susceptible to island cotton, highly or mildly infected with upland cotton and non-invasive cotton, all of which belonged to physiological race 7 and no physiological strains were found. According to the pathogenic reaction on six differential hosts, the tested strains in the long-staple cotton region can be divided into three types, that is, strong, moderate and weak, mainly of weak pathogenic type, accounting for 47.4% of the tested strains. The size of macrofuga was (1 3.7 ~ 2 3.6) μm × (2.7 ~ 5.4) μm, mostly of the Matt type. The mycelium was white, the bottom of the colony was purple or light purple, and some strains were easy to produce sticky conidia