Epidemiology of turcicum leaf blight in maize and identification of resistance sources

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dc.contributor.advisorDevlash, Rakesh
dc.contributor.authorKAJAL
dc.date.accessioned2022-02-08T10:13:50Z
dc.date.available2022-02-08T10:13:50Z
dc.date.issued2021-09-08
dc.description.abstractInvestigations on turcicum leaf blight of maize were undertaken with the objectives to study the role of environmental factors on disease development and identify resistance sources for turcicum leaf blight. The pathogen on PDA revealed grayish to blackish, fluffy growth. The conidia were cylindrical or straight, 3-8 septate with length varied from 81µm to 96 µm and width ranged from 18 to 24 µm. Maximum mycelial growth and sporulation of Exserohilum turcicum was observed on Oat Meal Agar The minimum mycelial growth was observed in V8 Juice. Age of the plants has got significant effect on the extent of susceptibility. Plants of all age groups were found to be infected by E. turcicum, but severity differed significantly with the age of plant. Significantly higher turcicum leaf blight infection was recorded on plant age group of 60 days. Maximum spore germination (90.43%) was recorded after 36 hr of incubation period. Maximum disease progression rate was observed during 35th MSW in Early Composite (20.5) and Dhari Local (20.4), whereas it was 10.7 in Bajaura Makka during 31st MSW. Disease intensity showed positive correlation with the maximum temperature and maximum relative humidity. Negative correlation was observed with minimum temperature minimum relative humidity and rainfall. The multiple correlation coefficients were highest in Early composite and Dhari Local (0.91), whereas, it was 0.89 in Bajaura Makka. The coefficient of multiple determinations indicated that relative humidity (maximum and minimum), temperature (maximum and minimum) and rainfall were responsible for 0.79 to 0.83 variations in disease intensity among different varieties. A total of fifty five maize inbreds comprising of twenty six medium maturity, twenty two early maturity and seven QPM along with two susceptible checks Dhari Local and Early Composite were screened against E. turcicum under artificially inoculated conditions. Fourteen medium maturity, fourteen early maturity and seven QPM inbreds were found resistant to TLB. Crude extract of Eucalyptus resulted in the highest mycelial growth inhibition at 10, 20 and 30 per cent concentration, where as crude extract of Allium sativum was found least effective at all the concentrations. In vitro evaluation of bioagent revealed that maximum mycelial inhibition (78.8 %) recorded in Trichoderma koningii (JMA-11) The crop loss estimation trials due to turcicum leaf blight revealed that loss in grain yield varied from 5.2 to 27.2 per cent depending upon the disease severity and level of resistance/susceptibility in different genotypes. Dhari Local recorded maximum yield loss (27.2%) followed by Early Composite (25.3%). Similar loss trends were observed in other yield attributing characters.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810181868
dc.keywordsconcentration,correlation,Maximum, germinationen_US
dc.language.isoEnglishen_US
dc.pages83en_US
dc.publisherPalampuren_US
dc.subPlant Pathologyen_US
dc.themeTo study role of environment factors on disease development and to identify resistance sources for turcicum leaf blighten_US
dc.these.typeM.Scen_US
dc.titleEpidemiology of turcicum leaf blight in maize and identification of resistance sourcesen_US
dc.typeThesisen_US
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