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Research Paper | Plant Pathology | India | Volume 12 Issue 8, August 2023 | Rating: 5.3 / 10
Assessment of the Colletotrichum Leaf Spot Disease of Turmeric in West Bengal, India: A Comprehensive Report on the Current Situation
Arijit Adhikary | Pijush Kanti Maji | Amitava Basu
Abstract: The low productivity in turmeric in West Bengal is due to severity of the foliar diseases.The leaf spot disease survey was conducted and the report of Cooch Behar and Nadia districts of West Bengal reveals that highest percentage of disease severity (PDI) are shown by locally cultivated varieties such as Malsari (53.12% ), Goma (57.49%), Pragati (55.35%) and Sonajuli (57.49%) with higher AUDPC value i.e. 4125.33, 3906.37, 4079.02 and 3237.89 respectively. On the other hand Resistance against leaf spot disease are shown by some varieties i.e. Uttar Rangini, Suranjana, Uttar Rupanjana, Lakadong, Megha etc. These varieties have shown lower PDI and lower AUDPC value compared to local varieties.The symptoms of leaf spot disease in turmeric, caused by Colletotrichum are characterized by variable-sized elliptical or oblong spots on the leaf blades forming greyish or brownish center with a yellow halo surrounded by the spots. Both leaf surfaces exhibit numerous black dot-like structures called acervuli, which are arranged in concentric rings. The spots are varied in size, ranging from 3.50 to 7.00 cm in length and approximately 3.40 to 4.60 cm in breadth. The pathogen is isolated from total eight locations during experimental findings. Code name of different collected isolates are given as CCDI-1(Dinhata), CCMI-2(Mondouri), CCPI-3(Pundibari), CCTI-4(Tufanganj), CCRI-5 (Rakhalmari Village), CCGI-6 (Gayeshpur Farm), CCBI-7 (Basantapur Village), CCLI-8 (CTRI Farm Dinhata). Morphological variations among the eight isolates are observed based on the size of conidia and setea. Isolate CCMI-2 have highest conidial length where as CCTI-4 has lowest size of conidia.
Keywords: Turmeric, Colletotrichum, PDI, Leaf spot
Edition: Volume 12 Issue 8, August 2023,
Pages: 2419 - 2427