~ 605 ~ ISSN Print: 2617-4693 ISSN Online: 2617-4707 IJABR 2024; 8(5): 605-607 www.biochemjournal.com Received: 07-02-2024 Accepted: 16-03-2024 Vinoda RH P.G Student, Department of Plantation, Medicinal, Aromatic and Spice Crops, Kittur Rani Channamma College of Horticulture, Arabhavi, Karnataka, India Dr. Srikantaprasad D Assistant Professor, Department of Plantation, Medicinal, Aromatic and Spice Crops, Kittur Rani Channamma College of Horticulture, Arabhavi, Karnataka, India Dr. Pushpa TN Assistant Professor, Department of Plantation, Medicinal, Aromatic and spice crops, Kittur Rani Channamma College of Horticulture, Arabhavi, Karnataka, India Dr. Sumangala Koulagi Assistant Professor, Department of Plant Pathology, Kittur Rani Channamma College of Horticulture, Arabhavi, Karnataka, India Dr. Mahathesha BN Naik Assistant Professor, Department of Plant Biotechnology, Kittur Rani Channamma College of Horticulture, Arabhavi, Karnataka, India B Abdulrazaq Ph.D. Scholar, Department of Horticulture, UAS, GKVK, Bengaluru, Karnataka, India Corresponding Author: Vinoda RH P.G Student, Department of Plantation, Medicinal, Aromatic and Spice Crops, Kittur Rani Channamma College of Horticulture, Arabhavi, Karnataka, India Studies on powdery mildew disease of advanced mutants lines in menthol mint Vinoda RH, Dr. Srikantaprasad D, Dr. Pushpa TN, Dr. Sumangala Koulagi, Dr. Mahathesha BN Naik and B Abdulrazaq DOI: https://doi.org/10.33545/26174693.2024.v8.i5h.1140 Abstract The present investigation was carried out during rabi - 2021-22 at Kittur Rani Channamma College of Horticulture, Arabhavi, Belagavi district, Karnataka. cv. Kosi and Kranthi were subjected to gamma irradiation and ten advanced mutants along with two checks cv. Kosi and CIM Kranthi were selected from M4 generation and evaluated for powdery mildew disease reaction under natural ecosystem in the months of November 2020 to February 2021. Among all the mutants highest percent disease incidence of powdery mildew was recorded by K20P41 and K20P23 at 70 Days after planting(DAP), 80 DAP and 90 DAP by showing small patches of white colored powdery masses on the upper surface of menthol mint leaves with chlorotic lesions on the opposite surface. When the disease progressed, these powdery patches grew in size and covered the entire abaxial surface of leaves causing defoliation and it happens in the mutant lines of Kranthi lineages. Significantly it reduces the crop production and cause serious economic losses upto10-20 percent (Kalra et al., 2005). Keywords: Japanese mint, lamiaceae, mutant lines, Erysiphe cichoracearum disease, symptoms Introduction Aromatic plants are attracting a lot of interest because they provide a wide range of safe, affordable, preventive and curative therapies that are helpful in achieving the objective of "health for all" (Suresh et al., 2012) [14] . While there are many aromatic plants, among them mint is the most important one growing in India. Many species of mints are being commercially cultivated in different parts of the world (Kumar et al., 2008) [5] . Recently based on morphological, cytological and genetic characteristics genus Mentha has been classified into 42 species, 15 hybrids and hundreds of subspecies, varieties and cultivars (Rhouma et al., 2021) [9] . Among them only four species including Menthol mint ( Mentha arvensis L.), Peppermint (Mentha piperita), Bergamot mint (Mentha citrata) and Spearmint (Mentha spicata) are predominantly cultivated in India. India is a top supplier of Menthol mint oil in the world and a large number of farmers in India are benefitted by its cultivation (Sharma et al., 2019) [11] . Mentha arvensis L. (2n = 96) is also called as Japanese mint, corn mint, field mint, or wild mint, It is believed that this species was originated in the Mediterranean basin and, from there it spread to the rest of the world by both natural and artificial means (Salehi et al., 2018) [10] . It is cultivated on a huge scale in Brazil, China, Paraguay, Japan, Thailand, Angola and India. In India it is largely confined to North India specially Uttar Pradesh, Punjab and Haryana. Temperate to tropical climate is suitable and sunny weather along with moderate rainfall is required for its luxuriant growth. A deep soil, rich in humus which can retain moisture is suitable for mint cultivation. Crop loss due to diseases has been identified as a major production constraint for mint. It has been reported to be affected by several diseases like rust ( Puccinia mentha), leaf blight (Rhizoctonia solani), leaf spot (Alternaria alternate), wilt (Verticillium dahliae), stolon rot (R. solani/bataticola), stem rot (Phoma stasseri) and powdery mildew (Erysiphe cichoracearum) among them powdery mildew is very important in the view of crop loses (Kalra et al., 2001) [3] . International Journal of Advanced Biochemistry Research 2024; 8(5): 605-607