The Journal of Phytopharmacology 2024; 13(4):321-327 ; DOI:10.31254/phyto.2024.13408
Comparative in vitro evaluation of fungicides against collar rot pathogen, Sclerotium rolfsii in elephant foot yam
Sreechithra MS1 , Sherin A Salam2 , Heera G2 , Shimi GJ3 , Radhakrishnan NV4
1. MSc Scholar, Department of Plant Pathology, College of Agriculture, Vellayani, Kerala Agricultural University, Thiruvananthapuram, Kerala, India
2. Assistant Professor, Department of Plant Pathology, College of Agriculture, Vellayani, Kerala Agricultural University, Thiruvananthapuram, Kerala, India
3. Assistant Professor, Department of Agronomy, College of Agriculture, Vellayani, Thiruvananthapuram, Kerala, India
4. Professor and Head, Department of Plant Pathology, College of Agriculture, Vellayani, Thiruvananthapuram, Kerala, India
*Author to whom correspondence should be addressed.
Received: 18th May, 2024 / Accepted: 11th August, 2024 / Published : 31st August, 2024
Amorphophallus or elephant foot yam (Amorphophallus paeoniifolius) popularly known as the ‘King of tubers’ is one of the major tuber crops grown in India and other parts of the world. Collar rot disease, caused by Sclerotium rolfsii is one of the primary obstacles to tuber cultivation which can significantly reduce yield up to 100%. Saprophytic nature, broad host range, and ability to produce resting structures make it difficult to manage. In this experiment, 10 isolates of S. rolfsii were isolated by the surveying Thiruvananthapuram, Kollam and Alappuzha districts of Kerala, proved the pathogenicity by inoculating the pathogen cultured in sand- maize meal media (9:1). The isolate I3 obtained from Thiruvananthapuram district was found to be the most virulent based on the days taken for symptom development (4 days). Six fungicides (copper oxy chloride (50% WP), mancozeb (75% WP), propiconazole (25% EC), carbendazim (50% WP), trifloxystrobin (25%) + tebuconazole (50%) 75 WG, and carbendazim (12%) + mancozeb (63%) WP @ 50, 100, 250, 500, 1000 and 2000 ppm were evaluated in vitro for their efficacy in inhibiting the fungal mycelial growth and sclerotia formation in isolate I3. All fungicides except carbendazim 50% WP and copper oxy chloride 50% WP, considerably reduced the mycelial development of S. rolfsii. Mancozeb 75%WP and trifloxystrobin (25%) + tebuconazole (50%) 75WG, showed complete inhibition of mycelial growth even at a lower concentration of 50 ppm.
Collar rot, Elephant foot yam, Fungicides, In vitro, Sclerotium rolfsii
HOW TO CITE THIS ARTICLE
Sreechithra MS, Sherin A Salam, Heera G, Shimi GJ, Radhakrishnan NV. Comparative in vitro evaluation of fungicides against collar rot pathogen, Sclerotium rolfsii in elephant foot yam. J Phytopharmacol 2024; 13(4):321-327. doi: 10.31254/phyto.2024.13408
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