An alternative approach for the chemical control of Fusarium wilt of tomato
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Authors
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N.C. MANDAL and A.K. SINHA
Department of Plaru Pathology, Bidhan Chandra Krishi Yiswavidyalaya, Kalyani 741 235, West Bengal
Keywords:
Tomato, Fusarium oxysporum f. sp. lycopersici, non-conventional chemicals, wet seed treatment, induced resistance, symptom inhibition, disease controlAbstract
Effectiveness of 19 non-conventional, mostly non-toxic chemicals in wet seed treatment, used at dilute concentrations (10.4 to 10-2M) in controlling Fusarium wilt of tomato has been tested in potted tomato plants (cv. Patharkuchi) inoculated with Fusarium oxysporum f. sp. lycopersici at the age of 3 weeks. While most of these compounds could reduce wilt symptoms appreciably, cupric chloride, ferric chloride, zinc chloride, manganese sulphate, mercuric sulphate, L-cysteine, IAA and DL-methionine showed very strong protective effect. These reduced leaf symptoms by 52 to 71 %, prevented mortality completely and also limited vascular colonization by the pathogen. Most of the test compounds showed little or no in-vitro fungitoxicity at their effective concentrations and stronger protection was often achieved at lower than higher concentration. It has been concluded, therefore, that these non-conventional chemicals act in plant disease control not so much by any direct toxic action but by inducing resistance in susceptible tomato plants, mediated through host tissue conditioning.
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