Chemical Control of Colletotrichum gloeosporioides causing Twister Disease in Onion

Author: Annapurna Gavireddy, S.B. Latake and V.S. Shinde

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Abstract

Twister disease caused by Colletotrichum gloeosporioides is an emerging threat to onion cultivation particularly during kharif season. Newer fungicides were evaluated for their efficacy against the pathogen. Under in vitro condition, though all the fungicides significantly inhibited the mycelial growth of pathogen, the combi-fungicide carbendazim 12% + mancozeb 63% WP @ 0.1% exhibited maximum inhibition (97.96 %) of mycelial growth of fungus C. gloeosporioides. Similarly, under field condition two foliar sprays of carbendazim 12% + mancozeb 63% @ 0.1% at 15 days interval recorded significant control of onion twister disease with least PDI (17.16). It was closely followed by tebuconazole 50% + trifloxystrobin 25% WG @ 0.2% (20.30 PDI) and metiram 55% + pyraclostrobin 5% WG @ 0.2% (26.80 PDI).

Keywords

Onion, twister disease, Colletotrichum gloeosporioides, fungicides

Conclusion

The results of the study suggest that two foliar sprays of carbendazim 12% + mancozeb 63% WP @ 0.1% or tebuconazole 50% + trifloxystrobin 25% WG @ 0.2% or metiram 55% + pyraclostrobin 5% WG @ 0.2% concentration at 15 days interval could aid in effective management of the twister disease particularly in kharif season and subsequently reduces the yield losses.

References

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How to cite this article

Annapurna Gavireddy, S.B. Latake and V.S. Shinde (2024). Chemical Control of Colletotrichum gloeosporioides causing Twister Disease in Onion. Biological Forum – An International Journal, 16(1): 243-246.