National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Four systemic fungicides viz., Folicur 25 EC (tebuconazole), Tilt 25 EC (propiconazole), Score 25 EC (difenoconazole), Amistar Top 325 SC (azoxystrobin 18.2% + difenoconazole 11.4%) and one non-systemic fungicide viz., Indofil M-45 75 WP (mancozeb) were evaluated under 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 was determined in controlling the purple blotch complex of onion seed crop (cultivar PRO-6) during the Rabi season 2015-16 and 2016-17. The field trial was conducted in Randomized Block Design (RBD) with six treatments along with four replications. All the recommended agronomical practices were followed during experimentation. The bulbs were planted during first fortnight of November at spacing of 67.5 cm X 45 cm. Foliar application of fungicides was started as soon as first symptom of the disease was noticed followed by three sprays at 15 days interval in bulb seed crop. The triazole fungicides, tebuconazole and difenoconazole proved superior in inhibiting growth of A. porri and S. vesicarium under field conditions. Four foliar sprays of tebuconazole 25 EC (Folicur) @ 0.1 per cent at fortnightly interval most effectively managed purple blotch complex in onion seed crop under field conditions with highest Benefit: Cost ratio (91.9:1). The present findings can go a long way in devising strategy for the integrated management of A. porri, S. vesicarium singly as well as in combination with other fungicides
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