Use of some essential oils as post-harvest botanical fungicides in the management of grey mould of grapes caused by Botrytis cinerea |
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Authors: | Pramila Tripathi N K Dubey A K Shukla |
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Institution: | (1) Department of Botany, D.A.V., P.G. College, Kanpur, 208001, India;(2) Department of Botany, Banaras Hindu University, Varanasi, 221005, India;(3) Department of Botany, Rajiv Gandhi University, Itanagar, 791112, India |
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Abstract: | During screening of twenty six essential oils against Botrytis cinerea, the essential oils of the ten plants viz. Chenopodium ambrosioides, Eucalyptus citriodora, Eupatorium cannabinum, Lawsonia inermis, Ocimum canum, O. gratissimum, O. sanctum, Prunus persica, Zingiber cassumunar and Z. officinale were found to exhibit absolute fungitoxic activity (100% growth inhibition). The essential oils of O. sanctum, P. persica and Z. officinale were selected for further investigation because these oils showed lower Minimum Inhibitory Concentration (MIC) as compared
to the other fungitoxic oils. The selected oils were subsequently standardized through physico-chemical and fungitoxic properties.
The MIC values of O. sanctum, P. persica and Z. officinale were found to be 200, 100 and 100 ppm (mg/l) respectively. The oils showed fungistatic nature at their respective MIC. The
oils were thermostable, and exhibited a wide range of fungitoxicity against 15 other post-harvest fungal pathogens. The oils
had the potency to withstand high inoculum density. The antifungal potency of oils was found to be greater in comparison to
some prevalent synthetic fungicides. Practical applicability of the essential oils was observed in control of grey mould of
grapes caused by B. cinerea during storage. The O. sanctum- and P. persica-oil-treated grapes showed enhancement of storage life up to 5 and 4 days respectively. The storage life of Z. officinale-oil-treated grapes was found to be enhanced up to 6 days. The oils did not exhibit any phytotoxic effect on the fruit peel.
Therefore, the oils could be recommended as a potential source of ecofriendly botanical fungicide, after long term and wide
ranging trials. |
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Keywords: | Essential oils Grey mould Fungitoxicity Botrytis cinerea Shelf life |
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