Survey, Occurrence of Major Onion Diseases and Management of Twister Disease of Onion (Allium cepa L.)

Purple blotch of onion caused by the fungus Alternaria porri is a serious disease in kharif season and more yield losses growing areas Maharashtra. A survey was conducted to assess intensity major diseases area Nashik district during 2020 2021 During survey, small whitish, leaf curling, twisting, chlorosis leaves, elongation neck cylindrical bulb such symptoms twister were observed severe than purple on 2020. The per cent severity ranged from 17.28 45.83 8.00 23.00 20.17 54.59 12.00 35.00 2021, respectively. diseased samples utilized for isolation pathogen. After morphological study, it indicated that complex pathogen Colletotrichum gloeosporioides, Fusarium sp. nematode. Due climate change, concluded found threatening 2021. Considering onion, investigation planned management 21. combine application Trichoderma drenching @ 10 g/l along with two alternate sprays each Tebuconazole 25.9 EC 1 ml/l or Azoxystrobin 23 SC@ recorded lowest PDI (14.33%) control treatment (49.11%) which effective maximum over (70.82%) onion.