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近几年来,我省主产棉区普遍发生枯黄萎病,特别是枯萎病发生蔓延很快,病情逐年加重。现有推广品种岱红岱和洞庭1号,在无病田表现高产优质,但不抗枯萎病,在重病田发病、死苗严重,产量和品质下降。选育推广抗病品种虽能防止枯黄萎病,如在重病田种植陕3563、澧74—282等抗病品种,抗病增产效果十分显著,但在无病田却不然,其产量和品质还不如岱红岱。而把抗病和高产结合起来考虑,利用抗病杂种优势则是兼顾病田和无病田夺取棉花高产的有效途径。一、抗病杂种优势的表现及其特性陆地棉品种间杂交,对枯萎病的抗病性,在杂种一代表现为显性。只要双亲中有一方是过得硬的高抗亲本,特别是以高抗亲本作母本,杂种一代就能具有
In recent years, most of the main cotton producing areas in our province have withered verticillium wilt. In particular, the occurrence of wilt disease spread rapidly and the condition is aggravating year by year. The existing varieties Dai Daihong Dai Dong and Dongting No. 1, in the disease-free field performance of high yield and quality, but not resistant to blight, disease in severe disease, severe dead seedlings, yield and quality decline. Breeding and popularizing disease-resistant varieties can prevent verticillium wilts, such as cultivating the resistant varieties such as Shaanxi 3563 and 澧 74-282 in severe diseases, and the effect of disease-resistant and yield-increasing is very remarkable. However, in the non-illness field, its yield and quality also As Dai Dai Dai. Considering the combination of disease resistance and high yield, taking advantage of disease-resistant heterosis is an effective way to take both yield and disease-free yield for cotton yield. First, the performance of disease-resistant heterosis and its characteristics Inter-Upland cotton hybrids, the resistance to Fusarium wilt disease in the hybrid generation is dominant. As long as one of the parents is a hard, high resistant parent, especially with a high resistant parent as a female parent, the hybrid can have