Assessment of fungicide spray schedules against turcicum leaf blight of maize caused by Exserohilum turcicum (Pass.) Leonard and Suggs

Approximately 200 sweet corn inbred lines were screened for two years for resistance to northern leaf blight, caused by Exserohilum turcicum, and Stewart's wilt, caused by Erwinia stewartii. Inbreds with the best levels of partial resistance to races 1 and 2 of E. turcicum included IL11d, IL676a, IL677a, IL685d, IL766a, IL767a and IL797a. Inbreds with the best partial resistance to E. stewartii included IL126b, IL676a, IL767a, IL772a, IL774g, IL797a, IL798a and M6011. Several of these resistant and moderately resistant inbreds had common ancestors; however, inspection of pedigrees suggested that resistance was derived from Puerto Rican, Bolivian, and other tropical sources and/or dent corn. Thus, many of the sweet corn inbreds may carry different genes for resistance and can be used for the development of populations with improved resistance.

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Screening of maize germplasm for Turcicum leaf blight resistance

Journal of Applied and Natural Science ◽

10.31018/jans.v10i1.1586 ◽

2018 ◽

Vol 10 (1) ◽

pp. 98-101

Author(s):

T. A. Wani ◽

G. N. Bhat ◽

Mushtaq Ahmad ◽

A. Anwar ◽

Gul Zaffar

Keyword(s):

Block Design ◽

Inbred Lines ◽

Leaf Blight ◽

Blight Resistance ◽

Exserohilum Turcicum ◽

Maize Germplasm ◽

Randomized Block Design ◽

Maize Genotypes ◽

Sorghum Grains ◽

Moderately Resistant

: A study was conducted during Kharif 2012 and 2013 at Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar Campus Srinagar with the objective of screening sixty maize genotypes against Turcicum leaf blight caused by Exserohilum turcicum (Pass.) Leonard and Suggs. Field experiment was laid out in a randomized block design with three replications. In order to ensure establishment of infection, artificial inoculation of E. turcicum on test genotypes was made twice at 30 and 40 days after sowing with two different methods of inoculation (spraying on foliage of maize with spore suspension of pathogen @ 5x104 spores/ml at 30 DAS and by whorl drop inoculation of pathogen multiplies on sorghum grains at 40 DAS). Disease severity on test entries was scored at silk drying stage and studies revealed that two inbred lines, viz., NAI-112 and NAI-147, and one hybrid, viz., HQPM-1 were found resistant with pooled disease intensity of 4.12 per cent, 4.04 per cent and 4.38 per cent, respectively. Four inbred lines, viz., KDM 381 A, KDM 918 A, NAI-152 and NAI-167 were found susceptible with pooled disease intensity of 52.82 per cent, 51.02 per cent, 58.58 per cent and 61.33 per cent, respectively. The remaining genotypes were moderately resistant to moderately susceptible.

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Evaluation of maize genotypes for Turcicum leaf blight (Exserohilum turcicum) in Terai and inner terai of Nepal

Journal of Maize Research and Development ◽

10.3126/jmrd.v2i1.16221 ◽

2016 ◽

Vol 2 (1) ◽

pp. 109-116

Author(s):

Tirtha Raj Rijal ◽

Govind KC ◽

Kesab Babu Koirala ◽

Jiban Shrestha

Keyword(s):

Disease Severity ◽

Pooled Analysis ◽

Leaf Blight ◽

Exserohilum Turcicum ◽

Sources Of Resistance ◽

Maize Productivity ◽

Maize Genotypes ◽

Disease Severity Scale ◽

High Yielding Varieties ◽

Moderately Resistant

Thirty maize genotypes in 2014-2015 at Dumarwana, Nijgadh, Keureni and Rampur and ten genotypes in 2015-2016 at Anandpur, Shitalnagar, Dumarwana, Nijgadh and Rampur were evaluated for resistance to Turcicum leaf blight (Exserohilum turcicum) under farmers field conditions. The scale used for disease severity ranged from 1-5 scale based on the proportionate leaf area affected by the disease. The combined analysis over locations in 2014-2015 showed that among the 30 genotypes 25 genotypes were resistant (1.0-2.0 scale), and 5 genotypes were moderately resistant (2.1-3.0 scale). Similarly the pooled analysis over locations in 2015-2016 showed that 7 genotypes were resistant (1.0-2.0 scale) and 3 genotypes were moderately resistant (2.1-3.0 scale). The maize genotypes namely Z376-26, Z478-3, Z433-99, Z464-5, Z478-2, Z466-1, CAH1513, RML-95/RML-96, CAH1515, CAH1521, CAH1515, CAH151, CAH153, ZH114228 , Z376-9, Z466-3, Z376-5, RML-32/RML-17, RML-86/RML-96 and 900MGold were resistant with disease severity scale of 1.5 and with higher grain yield in both the years. Thus above genotypes were identified as promising sources of resistance against E. turcicum and they can be used to develop disease resistant and high yielding varieties to enhance maize productivity in terai and inner terai of Nepal.

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