Management of Purple Blotch Complex of Onion in Indian Punjab

  • Ritesh Kumar Yadav Local Initiatives for Biodiversity, Research and Development
  • Amarjit Singh Department of Plant Pathology, Punjab Agricultural University, Ludhiana
  • Sandeep Jain Department of Plant Pathology, Punjab Agricultural University, Ludhiana
  • Ajmer Singh Dhatt Department of Vegetable science, Punjab Agricultural University
Keywords: Fungicides, Management, onion, purple blotch complex, Benefit, Cost ratio, triazole

Abstract

Six systemic fungicides viz.,  Kitazin 48 EC (iprobenfos), Tilt 25 EC (propiconazole), Folicur 25 EC (tebuconazole), Score 25 EC (difenoconazole), Amistar Top 325 SC (azoxystrobin 18.2% + difenoconazole 11.4%) and Nativo 75 WG  (trifloxystrobin 25% + tebuconazole 50%), and two non-systemic fungicides viz., Indofil M-45 75 WP (mancozeb) and Kocide 77 WP (copper hydroxide), were evaluated under in vitro and field conditions for their efficacy to manage purple blotch complex of onion caused by Alternaria porri and Stemphylium vesicarium. Field efficacy of  the fungicides at different concentrations were determined in controlling the purple blotch complex of onion under artificial epiphytotic conditions on bulb and seed crop (cultivar PRO-6) during the Rabi season 2014-2015 and 2015-2016, respectively. The triazole fungicides, tebuconazole and difenoconazole proved superior in inhibiting growth of A. porri and S. vesicarium under in vitro conditions, respectively. Further, foliar sprays (3 for bulb crop and 4 for seed crop) of tebuconazole 25 EC (Folicur) @ 0.1 per cent at fortnightly interval most effectively managed purple blotch complex of onion under field conditions with highest Benefit: Cost ratio (8.75:1 and 88.7:1) in bulb and seed crop, respectively. Seed-to-seed method of onion seed production recorded significantly lower disease severity and higher seed yield than that of bulb-to-seed method under natural epiphytotic conditions. The present findings can be instrumental in devising strategy for the integrated management of A. porri, S. vesicarium singly as well as in complex, serious limiting biotic factors in onion production.

 Int. J. Appl. Sci. Biotechnol. Vol 5(4): 554-565

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Author Biographies

Ritesh Kumar Yadav, Local Initiatives for Biodiversity, Research and Development
a Plant pathologist and works as Programme manager
Amarjit Singh, Department of Plant Pathology, Punjab Agricultural University, Ludhiana
Senior Extension Specialist, Department of Plant Pathology
Sandeep Jain, Department of Plant Pathology, Punjab Agricultural University, Ludhiana
Assistant Professor of Plant Pathology
Ajmer Singh Dhatt, Department of Vegetable science, Punjab Agricultural University
Senior Vegetable Breeder
Published
2017-12-24
How to Cite
Yadav, R., Singh, A., Jain, S., & Dhatt, A. (2017). Management of Purple Blotch Complex of Onion in Indian Punjab. International Journal of Applied Sciences and Biotechnology, 5(4), 454-465. https://doi.org/10.3126/ijasbt.v5i4.18632
Section
Research Articles