@article{Yadav_Singh_Jain_Dhatt_2017, title={Management of Purple Blotch Complex of Onion in Indian Punjab}, volume={5}, url={https://www.nepjol.info/index.php/IJASBT/article/view/18632}, DOI={10.3126/ijasbt.v5i4.18632}, abstractNote={<p>Six systemic fungicides <em>viz.</em>,  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 <em>viz.</em>,<em> </em>Indofil M-45 75 WP (mancozeb) and Kocide 77 WP (copper hydroxide), were evaluated under <em>in vitro </em>and field conditions<em> </em>for their efficacy to manage purple blotch complex of onion caused by <em>Alternaria porri</em> and <em>Stemphylium vesicarium</em>. 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 <em>Rabi</em> season 2014-2015 and 2015-2016, respectively. The triazole fungicides, tebuconazole and difenoconazole proved superior in inhibiting growth of <em>A. porri</em> and <em>S. vesicarium</em> under <em>in vitro</em> 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 <em>A. porri</em>, <em>S. vesicarium</em> singly as well as in complex, serious limiting biotic factors in onion production.</p><p> <em>Int. J. Appl. Sci. Biotechnol. Vol 5(4): 554-565</em></p>}, number={4}, journal={International Journal of Applied Sciences and Biotechnology}, author={Yadav, Ritesh Kumar and Singh, Amarjit and Jain, Sandeep and Dhatt, Ajmer Singh}, year={2017}, month={Dec.}, pages={454–465} }