Fungicidal Management of Basal Stem rot -A Soil Borne Diseases in Coconut

Author: V. Govardhan Rao, B. Neeraja, N.B.V. Chalapathi Rao, A. Kireeti, V. Anoosha, Vinayak Hegde, Ravi Bhat, Kiran Kumar K.C. and B. Srinivasulu

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Abstract

Coconut palm is affected by a large number of diseases, among which basal stem rot (BSR) disease caused by Ganoderma lucidum and Ganoderma applanatum are the most destructive and a major limiting factor in coconut production. The research was conducted during the year 2020-21 and 2022-2023 at Dr. YSRHU-Horticultural Research Station, Ambajipeta, Dr. B.R. Ambedkar Konaseema District, Andhra Pradesh under the research project ICAR-AICRP on Palms. Results indicated that among the chemical fungicides tested under in vitro, combi fungicide formulations i.e Hexaconazole 5% + Validamycin 2.5% SC and Azoxystrobin 11% + Tebuconazole 18.3% SC (Custodia), Famaxadone 16.6% + Cymaxanil 22.1% SC, Carbendazim 12% + Mancozeb 63% WP and Hexaconazole 4 % + Zineb 68% were found most effective with an inhibition range ~ 97% to 99 % and on par with single fungicide formulations i.e Hexaconazole 5% EC, Thifluzamide 24% SC and Mancozeb 75% WP at 100ppm, 250ppm and 500 ppm concentrations tested. When the selected fungicides further tested at field level, it was noticed that T6-Root feeding of Hexaconazole 5% + Validamycin 2.5% SC @4 ml in 100 ml water + soil drenching @2ml/litre with 15 litre/palm at quarterly interval recorded 40.75.00 per cent reduction over initial at 27 months after treatment followed by T7-Root feeding of Hexaconazole 5% EC alone recorded 36.20% reduction and thirdly T4- Root feeding of Hexaconazole 5% + Validamycin-2.5% SC @4 ml in 100 ml water recorded 32.08% reduction over initial.

Keywords

Basal Stem Rot, Coconut, Ganoderma, Fungicides, Root Feeding, Soil Drenching

Conclusion

Management of Basal stem rot disease in coconut with systemic fungicides were found highly effective as they can penetrate and spread to different parts of the plant. Root feeding of combi and systemic fungicides- Hexaconazole 5% + Validamycin-2.5% SC @4 ml in 100 ml water + soil drenching @2ml/litre- 15 litre/palm is found affective and advisable to manage the disease at field level.

References

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How to cite this article

V. Govardhan Rao, B. Neeraja, N.B.V. Chalapathi Rao, A. Kireeti, V. Anoosha, Vinayak Hegde, Ravi Bhat, Kiran Kumar K.C. and B. Srinivasulu (2023). Fungicidal Management of Basal Stem rot -A Soil Borne Diseases in Coconut. Biological Forum – An International Journal, 15(10): 447-453.