EFFICACY OF SOME FUNGICIDES IN CONTROLLING PURPLE BLOTCH OF ONION UNDER WEST BENGAL CONDITIONS

R. DAS¹*
¹Department of Plant Pathology, Regional Research Sub-Station (Red & Laterite Zone), Sekhampur, Birbhum, 731129, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, 741252, West Bengal, India
* Corresponding Author : rajudas05@gmail.com

Received : 02-10-2022     Accepted : 27-10-2022     Published : 30-10-2022
Volume : 14     Issue : 3       Pages : 1989 - 1991
Int J Microbiol Res 14.3 (2022):1989-1991

Keywords : Purple blotch disease, Fungicides, Onion
Academic Editor : Dr M.G. Rathod, Dr Ranjana Hawaldar
Conflict of Interest : None declared
Acknowledgements/Funding : Author is thankful to Department of Plant Pathology, Regional Research Sub-Station (Red & Laterite Zone), Sekhampur, Birbhum, 731129, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, 741252, West Bengal, India
Author Contribution : Sole author

Purple blotch disease has become a very serious disease of onion causing considerable yield loss in onion production. In the absence of resistant cultivars, management of Purple blotch disease has relied principally on application of synthetic fungicides. The present study evaluated the effects of fungicides on Purple blotch disease of onion and investigated the efficacy on yield of onion. The field experiment was laid in a randomized block design with five treatments and four replications in subtropical climatic condition of West Bengal at Regional Research Sub-Station (Red & Laterite Zone), Sekhampur, Birbhum, 731129, West Bengal, India during Rabi, 2020-21 and Rabi, 2021-22. The highest disease control was in Boscalid 26.7%+Pyraclostrobin 13.3% WG @ 1.0 g/litre of water (56.62%) followed by Metiram 55% + Pyraclostrobin 5% WG @ 1.0 g/litre of water (53.11%) and Azoxystrobin 18.2% w/w + Difenoconazole 11.4% w/w SC @ 1.0 ml/litre of water (48.05 %) at 15 days after 2nd spray. Maximum increase of marketable onion bulbs yield (67.98%) was obtained by the spray of Boscalid 26.7%+Pyraclostrobin 13.3% WG @ 1.0 g/litre of water as compared to other treatments

1. Amin A.A., Rashad M., EL-Sh EL-Abagy H.M.H. (2007) Journal of Applied Science Research, 3(11), 1554-1563.
2. Socio-economic statistical information about India (2015) www.indiastat.com
3. Yadav P.M., Rakholia K.B., Pawar K.B. (2013) The Bioscan, 8(4), 1295-1298.
4. Sharma S.R. (1986) Indian Phytopathol., 39, 78-82.
5. McKinney H.H. (1923) J. Agri. Res., 26, 195-217.
6. Bradley C.A. (2011) The Bulletin. Pest management and crop development information for Illinois, No. 2 Article 4/April 8. Accessed on 11-08-2017.
7. Chethana B.S., and Kachapur, M.R. (2010) Geobias, 37(4), 253-261.
8. Shahnaz V.K., Razdan S.E.H., Rizvi T.R., Rather, Gupta S., Andrabi M. (2013) Journal of Agricultural Science, 5(1), 17-22.