National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Bacterial soft rot is one of the most common diseases of vegetables including potato which is found both in field and storage. Although, various micro-organisms are responsible for the soft rot disease in potato but Erwinia carotovora is mostly responsible for this disease. Use of chemical antibiotics on stored products can lead to the development of multidrug resistance in various human pathogenic bacteria causing severe health complications. In this present study, 13 aqueous plant extracts were evaluated against soft rot causing pathogen, Erwinia carotovora in-vitro. Among them, best control with highest mean diameter zone of inhibition of 11.7mm against the test bacterium was shown by Datura stramonium followed by Ficuscarica with mean diameter zone of 9.5mm. Other extracts with decreasing order of efficacy were Polygonum hydropiper (leaves), Populus alba (leaves), Trigonella foenum-graecum (seeds), Azadirachta indica (leaves), Curcuma longa (Rhizome) and Salix alba (green bark). Extracts of Cannabis sativa (leaves), Zingiber officinale (rhizome), Juglans regia (leaves) and Conyza canadensis (leaves) showed moderate efficacy against the test bacterium and least zone of inhibition was exhibited by Anthemis cotula (leaves). Standard check (streptomycin @ 150ppm) gave mean diameter zone of inhibition of 15.3mm.Three extracts which proved highly effective in-vitro were evaluated on potato tubers against the disease at different inoculation times viz 12 hours prior to, simultaneously and 12 hours after the inoculation of the pathogen. Among them, highest control was shown by Datura stramonium when applied simultaneously with the pathogen inoculation, exhibiting disease severity of 24% and 25.6%,when applied 12 hours prior to the inoculation of the pathogen, followed by Ficuscarica when applied 12 hours prior to inoculation of the pathogen with severity of 31.2% after 6 days of storage.
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