To Evaluate the Effectiveness of Fungicides and Bio-pesticides Against Purple Blotch in kharif Onion

Author: M.K. Pandey, P.K. Gupta, R.C. Gupta and M.K. Pathak

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Abstract

Purple blotch, a fungal disease in onion is one of the major causes of incurred loss of onion bulbs in Kharif season. This present study aimed to determine the effectiveness of different fungicides and bio - pesticides against purple blotch disease of onion in field conditions. A field trial was carried out at Regional Research station, NHRDF, Nashik for two consecutive years during Kharif 2019 and 2020 on onion variety Agrifound Dark Red for the management of purple blotch disease of onion through sequential spray of different fungicides with bio - pesticides. The result showed that, significantly minimum purple blotch incidence (38.75%) with intensity (4.65%) and highest gross yield (163.47 q/ha) with marketable (130.17q/ha) were recorded in Spray of Propiconazole @ 0.15 % at 30 DAT + spray of Ps. fluorescencs @ 5.0g/L at 45DAT + spray of Trifloxystrobin 25% + Tebuconazole 50%@0.2% at 60 DAT + spray of T. viride @5.0g/ L at 75DAT.

Keywords

Onion, Purple blotch, Incidence, Intensity, Bio - pesticides, Fungicides

Conclusion

The combined data of trial conducted at RRS, Nashik during kharif, 2019 and 2020 on onion variety Agrifound Dark Red revealed that the treatment T2: Spray of Ps. fluorescens @ 5.0g/L at 30 DAT + spray Tricyclazole@ 0.2% at 45 DAT + spray of T. viride @ 5.0g/L at 60 DAT + spray of Hexaconazole@ 0.2% at 75 DAT performed at par with purple blotch disease intensity (5.55%) as well as highest B:C ratio (9.01:1) because of the lower cost of the fungicides. The onion bulbs were found free from pesticide residue tested after harvest. While the treatment T1: spray of Propiconazole @ 0.15% at 30 DAT + spray of Ps. fluorescens @ 5.0g/L at 45 DAT + spray of Trifloxistrobin 25% + Tebuconazole 50%@ 0.2% at 60 DAT + spray of T. viride @ 5.0g/L at 75 DAT performed with lowest purple blotch intensity (4.65%) in comparison to intensity in untreated control (7.45%). However, the B: C ratio (5.82:1) was recorded because of the higher cost of the fungicides.

References

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How to cite this article

M.K. Pandey, P.K. Gupta, R.C. Gupta and M.K. Pathak (2023). To Evaluate the Effectiveness of Fungicides and Bio-pesticides Against Purple Blotch in kharif Onion. Biological Forum – An International Journal, 15(4): 246-249.