Evaluation of leaf blotch tolerance in turmeric genotypes from the terai region of West Bengal

The current investigation was done in the research farm of Uttar Banga Krishi Viswavidyalaya for finding out the genetic potential of yield characters of 30 genotypes of turmeric and screening them against the leaf blotch disease in the field during 3 cropping seasons 2019–2020, 2020–2021 and 2021–2022 respectively. Performance of genotypes against the leaf blotch disease was evaluated by estimation of their individual response in area under disease progress curve (AUDPC) and relative area under disease progress curve (rAUDPC) values during 3 cropping seasons 2019–2020, 2020–2021 and 2021–2022 and percentage disease index (PDI) taken at the time of infestation. According to scale of tolerance, in leaf blotch PDI, maximum PDI of leaf blotch disease was observed in Tarakeswar local (68.70 %) and minimum was found in Duggirala (31.32 %) and in overall identification of 30 genotypes, 10 genotypes were found resistant for leaf blotch disease, 9 genotypes were moderately resistant and 10 genotypes were found susceptible and Tarakeswar local was the only genotype which was found highly susceptible. Resistant genotypes can be chosen for the crop improvement programme for releasing varieties in future.