Eco-friendly Post Harvest Management of Pectobacterium caratovora subsp. caratovora causing Bacterial Soft rot of Carrot in Meghalaya, India

Author: Ashwini E., Nandeesha S.V. and Sakthi Priya P.

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Abstract

Carrot (Daucus carota L.) is one of the most important and widely grown root vegetables in Meghalaya and ranks among the top-ten important vegetable crops, in terms of both area of production and market value. Bacterial soft rot is the major postharvest disease of vegetables and reported losses up to 15-30%. It is having broad host range causes severe post-harvest loss during transits and storage. An eco-friendly post-harvest management was undertaken to manage the bacterial soft rot with the combination of potential Bacillus subtilis isolates, botanicals, post harvest salts and packaging materials on severity of bacterial soft rot. Eight potential Bacillus subtilis isolates (Bs110, Bs216, Bs167, Bs190, Bs174, Bs217, Bs219 and COB5Y1) were tested against soft rot pathogen by paper diffusion disc method. Among them the isolate B216 measured with highest (16.3mm) zone of inhibition, followed by Bs190 (15.1mm). In-vitro evaluation of botanicals (neem, beetlevine, garlic, vetiver and aloe vera) at three different concentration (3%, 5% and 10%) was evaluated. Among them garlic at 10% was showed most effective botanical with 10.8mm inhibition zone, followed by neem (8.83mm) at 10%. Among the tested postharvest salts (sodium bicarbonate, ammonium bicarbonate sodium hypochlorite and acetic acid) at different concentration, sodium hypochlorite at 5% concentration was showed maximum zone of inhibition (12.17mm) followed by ammonium bicarbonate (11.7mm ) at 3%. Among the packaging material (net bag, gunny bag, perforated polythene bag and bamboo box), net bag was found most effective with less severity of (8.51%), followed by gunny bag with (10.52%) of severity. Among the integrated treatments (sodium hypochlorite and net bag combination) was found effective in reducing soft rot severity of 6.80%, followed by garlic and net bag combination with 7.7% severity. Garlic, Sodium hypochlorite and Net bag in alone and in combination were found most effective and promising in preventing the post harvest losses caused by Pectobacterium caratovora subsp. caratovora in both transits and storage.

Keywords

Botanicals, Carrot, Meghalaya Post harvest salts and Pectobacterium caratovora subsp. Caratovora

Conclusion

From the present investigation it could be concluded that P. caratovora subsp. caratovora was the major pathogen associated with postharvest bacterial soft rot of carrot. It was found that Bacillus subtilis, Garlic, Sodium hypochlorite and Net bag at different concentration and combination could be the promising treatments against P. caratovora subsp. caratovora causing bacterial soft rot of carrot. Garlic, Sodium hypochlorite and net bag are good components in integrated postharvest disease management of carrot in Meghalaya. Further studies is needed to be done in in vivo conditions to see the results which found effective in in vitro conditions for adoption of best management practice for preventing the pre and post harvest loss of carrot in field and storage and to increase the income of farmers. This eco-friendly management practices can be widely adopted in larger area for the prevention of post-harvest losses in storage.

References

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How to cite this article

Ashwini E., Nandeesha S.V. and Sakthi Priya P. (2022). Eco-friendly post harvest management of Pectobacterium caratovora subsp. caratovora causing bacterial soft rot of carrot in Meghalaya, India. Biological Forum – An International Journal, 14(4): 55-63.