Himachal Journal of Agricultural Research

Gaurav Sharma ¹, Uttam Chandel ², Satish Kumar Guleria ³, Rakesh Devlash ³

Affiliations
1 Department of Genetics and Plant Breeding, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur-176 062, IN
2 CSKHPKV, Shivalik Agricultural Research and Extension Centre, Kangra, IN
3 Hill Agricultural Research and Extension Centre, Bajaura (Kullu), IN

Abstract

Turcicum leaf blight (TLB) and Maydis leaf blight (MLB) are amongst the important diseases of maize grown in the North-Western Himalayas. The experimental material was evaluated at two environments (natural E₁ & inoculated E₁) representing different agroclimatic and ecological conditions of North-Western Himalayas (SAREC, Kangra E₁ and HAREC, Bajaura E₁) to identify new resistance sources and to establish durability of known resistance sources of 8 parental genotypes, their 28 crosses and four checks viz., Palam Sankar Makka-2, Vivek Hybrid-45, Bio-9544 and DKC 7074 and were evaluated in RBD during Kharif, 2019 under natural conditions in E , whereas, under both natural as well as artificial epiphytotic conditions in E₁. The present study indicated the identification of 3 parental lines viz., P₃, P₆, P₄ cross combinations viz., P₃ × P₄, P₃ × P₅, P₃ × P₆, P₇ × P₈ and checks viz., Palam Sankar Makka-2, Vivek Hybrid-45 and DKC 7074 exhibiting resistant reaction against TLB in both environments under natural conditions and under artificial condition in E₁, whereas, against MLB under both natural as well as artificial epiphytotic condition in E₁. The new sources of resistance in the present study will be helpful for their deployment in the breeding programmes. The identified lines against TLB and MLB would serve as valuable sources of resistance and can be utilized in resistance breeding programmes. The cross combinations can be further evaluated for yield and other characters and can be released as promising hybrid varieties resistant to TLB and MLB.

Keywords

Maize, TLB, MLB, Natural Conditions, Artificial Conditions.

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Raghav Bantu ¹, Rakesh Devlash ², S. K. Rana ¹, S. K. Guleria ²

Affiliations
1 Department of Plant Pathology, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur-176 062, IN
2 CSKHPKV Hill Agricultural Research and Extension Centre, Bajaura, District Kullu (HP), IN

Abstract

Turcicum leaf blight (TLB) caused by fungus Exserohilum turcicum is most devastating maize foliar disease in North western Himalayan region of the world. The present investigations were carried out to screen the 70 medium maturing maize inbreds against TLB under artificial epiphytotic conditions.. The per cent disease index ranged from 13.3 - 80.0 and area under disease progressive curve was 300.0 - 1591.7 whereas apparent infection rate varied from 0.020 - 0.070. Based on disease rating scale, per cent disease index, AUDPC and apparent infection rate inbreds CML50, CML119, CML577, 36128, CML44 (OP), CML494, 9402-1, Bajim-08- 26, CML112, CML 292, 52303, LM 13, 1336-3, Bajim 06-17, CML563, Bajim 12-6, Bajim 12-6, CML 564, CML 31-1/CM112, V 6642, CML 112 WH 52323, Bajim 06-8, 30R-77, 52060, P358, 52154, 52200, Bajim 08-27 New Line, CML 33, CML 337, HKI1295, CML141 had lowest values for all pathological traits marked as resistant inbreds, whereas thirteen inbreds were reported moderately resistant. Results suggested that the inbreds found resistant to turcicum leaf blight might be utilized in future breeding program. Alternatively, the said promising inbreds might also be used as parents in hybridization in order to transfer the gene for resistance to existing adapted high yielding cultivars.

Keywords

Maize, Turcicum Leaf Blight (TLB), Resistance.

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