Evaluation of Plant Extracts against Ralstonia solanacearum causing Storage Rot of Ginger

Author: Sonal Kumar, Ashok Bhattacharyya, Pranab Dutta and Jayant Sahu

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Abstract

Ginger (Zingiber officinale Rosc.), a tropical plant in the Zingiberaceae family, is grown in nearly every country due to its culinary and therapeutic qualities. It is frequently used to season, taste, and add aroma to a variety of dishes during preparation, which raises the food's perceived value. A complex disease known as "storage rot" affects ginger which is caused by Ralstonia solanacearum, Fusarium spp., and Pythium spp. Storage rot causes up to 30% loss in value of ginger after harvest in Assam. In present investigation aqueous extracts of ten plants i.e. Acorus calamus, Allamanda cathertica, Allium cepa, Allium sativum, Curcuma longa, Datura wrightii, Lasia spinosa, Laurus nobilis, Ocimum sanctum, and Piper betle were tested against R. solanacearum. The growth of bacteria was significantly reduced by 20% in aqueous extracts of A. sativum and the rest of botanicals were not able to restrict the growth of plant pathogens in vitro. Further testing at four distinct concentrations (5, 10, 15, and 20%), A. sativum showed inhibition of 6.40, 9.40, 10.80, and 11.60 mm against R. solanacearum. Thus, A. sativum can be employed as a crucial component of integrated disease management.

Keywords

Ginger, Ralstonia, botanicals, Allium sativum

Conclusion

In the present study, out of ten botanicals tested, only A. sativum exhibited inhibition of R. solanacearum. The most effective botanicals were further tested against pathogenic bacteria at 5, 10, 15 and 20 per cent concentration respectively. A. sativum at 20 per cent showed the maximum inhibition zone followed by 15 and 10 per cent concentration. The lowest inhibition zone recorded at 5 per cent concentration. Among the three concentrations, tested for aqueous extract of each botanical, 20 per cent was found to be most effective over 15, 10 and 5 per concentrations. Thus, A. sativum has potential as a substitute for just using synthetic fungicides and can be employed as a crucial component of integrated disease management.

References

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How to cite this article

Sonal Kumar, Ashok Bhattacharyya, Pranab Dutta and Jayant Sahu (2023). Evaluation of plant extracts against Ralstonia solanacearum causing storage rot of Ginger. Biological Forum – An International Journal, 15(10): 365-370.