A Vitro Management of Four Tomato Fungal Pathogens Using Plant Extracts and Fermented Products
Date
2015-05
Authors
Journal Title
Journal ISSN
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Publisher
Department of Botany
Abstract
Tomato, a popular vegetable crop, used in various dishes contains most of the
essential nutritional requirements. It is the major commercial vegetable that can
be grown throughout the country. Alternaria sp., Colletotrichum sp., Stemphylium
sp. and Verticillium sp. are the important infectious causal agents that had
threatened tomato. Regular use of chemical fungicides creates a hazardous effect
to the environment and human health too. Fresh plant extracts and fermented
products are easily available, easy to prepare, non hazardous to environment and
human too. The organic compounds and secondary metabolites present in them
are lethal to mycelia growth of these pathogens.
Three wild plants (Agave cantula, Ageratina adenophora and Melia azeradach)
are used for experimentation to control the mycelia growth of four tomato test
pathogens in both form i.e. fresh extract and fermented form. Mancozeb
(0.2mg/ml) used as positive control showed the reduction in mycelia growth of
Alternaria sp., Colletotrichum sp., Stemphylium sp. & Verticillium sp. by 63.30%,
100%, 74.02% and 58.33% respectively. In the experiments, among three tested
samples, both form of Agave cantula showed significant inhibitory effect to
mycelia growth of three tomato pathogens v.i.z. Colletotrichum sp. (100%
inhibition at 50% conc. of fresh extract and 100% inhibition at 60% conc. of
ferment), Stemphylium sp. (83.33% inhibition at 60% conc. of fresh extract and
80.9% inhibition at 60% conc. of ferment) and Verticillium sp. (88.11% inhibition
at 60% conc. of fresh extract and 88% inhibition at 60% conc. of ferment). Fresh
extract and fermented product of A. cantula showed less inhibitory effect to the
mycelia growth of Alternaria sp. (42.58% inhibition at 60% conc. of fresh extract
and 44.29% at 60% conc. of ferment). It may be effective to A. solani at higher
concentration.
Description
Keywords
Ageratina adenophora, Agave cantula, Fermented plant extract, Verticillium