Evaluation of Inbred Lines and Development of Turcicum Leaf Blight Resistant Single Cross Maize Hybrids

Turcicum leaf blight (TLB) is the most important disease of maize growing areas of India. To identify new resistance sources and establish durability of known resistance sources, 30 maize inbred lines were evaluated against TLB under artificial inoculation during kharif 2013 and kharif 2014. Ten inbred lines were found resistant against TLB. Based on per se performance and resistance to TLB nine inbred lines viz., DMIT 105, DMIT 106, DMIT 111, DMIT 113, DMIT 118, DMIT 121, DMIT 123, DMIT 124 and DMIT 125 were used to develop 36 single cross hybrids and were screened to identify resistant hybrids. Thirty two hybrids were found resistant with disease score 1 and 2. Based on percent disease index (PDI) and area under disease progress curve (AUDPC) values, the components of blighting, inbred lines viz., DMIT 105, DMIT 113, DMIT 118 and DMIT 126 and hybrids viz., DMIT 105 × DMIT 125, DMIT 106 × DMIT 111, DMIT 106 × DMIT 121, DMIT 106 × DMIT 125, DMIT 111 × DMIT 113, DMIT 111 × DMIT 121, DMIT 113 × DMIT 118, DMIT 113 × DMIT 121, DMIT 113 × DMIT 125, DMIT 118 × DMIT 121, DMIT 118 × DMIT 124 and DMIT 121 × DMIT 123 were identified as slow blighters. These hybrids should be involved in the crop improvement programmes

Not Available

Not AvailableTurcicum leaf blight and common rust are regularly appearing foliar diseases in sweet corn during kharif season in severe form. Both the diseases develop rapidly usually disease appeared and develop before flowering at knee high stage resulting complete necrosis of the leaf and premature death of plants. Intensive roving survey conducted during kharif 2017 in Karnataka implied that, both the diseases found in severe form but severity varied from one to another locality due to factors like, climatic conditions, soil type, cropping pattern, genotype and other cultural practices followed. Maximum severity of TLB observed in the Chikkballapur district (56.54%) at dough stage of the crop, grown under rainfed situation on red soil. Maximum severity of common rust was found in Belagavi district (43.73%) at silking stage of the crop cultivated under irrigated situation on black soil. Least severity of TLB (49.00%) was recorded in the Belagavi district and common rust (37.81%) was in Chikkaballapur districtNot Availabl

Not Available

Not AvailableAbstract: Turcicum leaf blight (TLB) caused by Exserohilum turcicum (Pass.) Leonard and Suggs is one of the most important foliar diseases of Maize. Host-plant resistance provides sustainable disease management option. With an objective to identify new source of resistance to TLB, 237 newly developed maize inbred lines were evaluated for two consecutive years at four location in India (Dharwad, Mandya, Almora and Bajaura) under artificially created disease epiphytotics. The disease reaction of individual genotype was rated on 1-9 scale. On the basis of pooled mean over locations, 41 inbred lines were found resistant (disease incidence <3.0), 181 inbred lines were moderately resistant (disease incidence 3.1-5.0) and 15 inbred lines were moderately susceptible (disease incidence 5.1-7.0). Out of 41 inbred lines, 33 lines viz. IMLSB-57-2, IMLSB-119-1, IMLSB-143-1, IMLSB-205-1, IMLSB-244- 1, IMLSB-246-2, IMLSB-266-2, IMLSB-306-1, IMLSB- 317-1, IMLSB-334B-1, IMLSB-343-1, IMLSB-343-2, IMLSB-380-1, IMLSB-428-2, IMLSB-446-2, IMLSB-475- 2, IMLSB-568-2, IMLSB-748-1, IMLSB-801-2, IMLSB- 807-1, IMLSB-825-2, IMLSB-955-1, IMLSB-956-2, IMLSB-975-2, IMLSB-976-2, IMLSB-1018-1, IMLSB- 1041-4-1, IMLSB-1043-1-1, IMLSB-1299-1, IMLSB- 1299-7, IMLSB-1381, IMLSB-2034, IMLSB-2136 were resistant at three locations and across location (mean basis), whereas 8 inbred lines IMLSB-282-2, IMLSB-310-2, IMLSB-1046-3-1, IMLSB-1047-1-1, IMLSB-1376, IMLSB-2051, IMLSB-2119, IMLSB-2166 were resistant at two locations and across mean basis. These 41 maize inbred lines, possessing resistance to turcicum leaf blight can be used successfully in developing promising hybrids.Not Availabl