长绒棉枯萎病分布及品种(品系)抗性评价

Evaluating on Resistance of Varieties(Lines) and Distribution to Fusarium Wilt on Long-staple Cotton

20 0 0～ 2 0 0 2年我们对新疆长绒棉主要种植区棉花枯萎病分布、危害症状、现有主栽长绒棉品种及部分品种(品系 )的抗性进行了调查研究。新疆长绒棉枯萎病病症以黄色网纹型为主 ,兼有黄化型、紫红型、青枯型 ,除系统侵染整株造成子叶、真叶、茎杆产生病症外 ,棉花枯萎病还造成棉花雷、铃的苞叶叶脉黄化 ,呈现黄色网纹。长绒棉枯萎病发病严重 ,现有主栽长绒棉品种对棉花枯萎病均不抗病 ,2 0 0 1年调查结果表明 ,供试 32个长绒棉品种 (品系 )抗病性均较差 ,病情指数为 70 15 %～ 99 5 3%。

Cotton Fusarium wilt (.Fusarium oxysporum Schlecht f.sp..vasinfectum Atk.Sny.& Hans ) is one of the most important diseases on long-staple cotton (.G.barbadense) in Xinjiang.The resistance of 32 varieties (lines) of long-staple cotton to Fusariium wilt, was identified in 2000-2001 in Awati county, Xinjiang.The result was showed that the resistance of all varieties(lines) against Fusarium wilt was very poor.New symptom of Fusarium wilt on long-staple cotton (.G.barbadense), that has been found in Xinjiang, is that the main veins of cotton bract develop chlorosis, it is different from other symptoms, but up to now, it hasn't been found on ‘upland' ( Gossypium hirsutum ).