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Redressal of Banded leaf and Sheath Blight of Maize through Breeding, Chemical and Biocontrol Agents

机译:通过繁殖,化学和生物管制剂的玉米带状叶和鞘枯萎的修复

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The present investigation incorporates results obtained on the three important aspects of management of the disease Banded leaf and sheath blight of maize caused by Rhizoctonia solani f.sp. sasakii. Even though efforts to locate resistant genes have led to rather frustrating outcomes, in this study it has been possible to identify at least 13 germplasms possessing some resistance (tolerance) to this disease. Adoption of chemical fungicides also gave encouraging results with two chemicals, namely Rhizolex and Thiophenate-M, giving significant practical control of this disease. Regarding biocontrol of the disease, it could be observed that isolate of Pseudomonas fluorescens from maize rhizosphere was most antagonistic to R. solani f.sp. sasakii, showing highest inhibition zone and the least number of sclerotia produced. Similarly, biocontrol agent Trichoderma harzianum also gave encouraging results in vitro. Isolates T. harzianum obtained from Pantnagar, Dharwad, and Delhi gave more than 60 per centinhibition of the pathogen in vitro. Use of P. fluorescens as biocontrol option appears to be exciting as seed treatment and soil application of the bacterium not only reduced the disease to more than 50 per cent but also resulted in consequent increasein grain yield. In vitro evaluation of fungicides indicated that Bavistin, Rhizolex, and Thiophenate M gave almost absolute inhibition of R. solani growth. It is envisaged that under field conditions also these fungicides would be potent enough to give high level of disease control.
机译:本研究纳入了由Rhizoctonia Solani F.SP引起的疾病带状叶和玉米鞘枯草的三个重要方面获得的结果。 Sasakii。尽管定位抗性基因的努力导致了相当令人沮丧的结果,但在本研究中,已经可以鉴定至少13种具有对该疾病的抗性(耐受性)的细菌。采用化学杀菌剂也给予了令人鼓舞的结果,其中两种化学物质,即Rhizolex和噻吩-M,对该疾病进行了重大实际控制。关于该疾病的生物控制,可以观察到玉米根际的荧光荧光荧光素的分离物对R. Solani F.SP的拮抗作用。 Sasakii,显示出最高的抑制区和所产生的巩膜最少数量。同样,生物控制剂Trichoderma Harzianum也给予体外令人鼓舞的结果。分离出从Pantnagar,Dharwad和Delhi获得的Harzianum,在体外超过60%以上的病原体。用P.荧光型作为生物控制选项似乎是令人兴奋的,因为种子处理和土壤施加的细菌不仅将疾病降低到50%以上,但也导致了谷物产量的增加。对杀菌剂的体外评估表明,巴伐利氏素,Rhizolex和噻吩酯几乎绝对抑制R.Solani生长。设想,在现场条件下,这些杀菌剂也会有效地足以给予高水平的疾病控制。

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