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Pre-application of plant extracts as resistance inducers provided protection of tomato plants and reduced wilt incidence from 84.46 8.40% with the minimum in garlic extract treated seedlings followed by neem and zinger extract representing 10.70 and 11.90%, respectively. Treatment with plant extracts as inducers prior to challenge inoculation sensitized the seedlings to produce increased levels of soluble protein with the maximum in garlic extract treated seedlings representing 29.5, 32.40, and 31.6 mg/g of fresh leaves of 5, 10 and 15 days of pathogen inoculation whereas, in case of control-1 and control-2 the values were 21.80, 22.50 and 22.00 mg/g and 18.98, 20.90 and 19.90 mg/g of fresh leaves, respectively. A high content of phenol, which is an indicator of first stage of defence mechanism, was also recorded maximum in garlic extract treatment as 2.09, 2.26 and 2.18 mg/g of fresh leaves against 1.50, 1.59 and 1.58 mg/g and 1.40, 1.50 and 1.46 mg/g in case of control-1 and control-2 at 5, 10 and 15 days of pathogen inoculation. Correlation coefficient between disease incidence with soluble protein (r = –0.572) and total phenol (r = –0.533) showed a negative correlation with disease incidence. Introduction Tomato is one of the most valued vegetable crops of the world owing to its high nutritive value as well as its antioxidant and curative properties. Production of tomato is limited due to various pests and diseases among which Fusarium wilt caused by Fusarium oxysporum f. sp. lycopersici is one of the most important ones. The conventional method of its control is based on direct elimination of the pathogen, but researches are going on in search of non-conventional and eco-friendly management measures which can give well return to growers and reduces the environmental pollution. In this context, induced resistance as a technique of phyto-immunity has received a great attention. Various types of biological agents, virulent or avirulent strains of pathogens, plant extracts, crude extracts and chemicals which are not considered as fungicides are used for induction of resistance in various crops (Cohen 1994, Attitalia et al. 1998, De Cal and Melgarejo 2001, Biswas et al. 2012). The physical and bio-chemical changes associated with induction of resistance are also a common phenomenon reported by several workers (Van Loon 1983, Biswas et al. 2003, Arzoo et al. 2012, Biswas et al. 2012,). Aqueous extracts of barley leaves induced oversized papillae formation in barley which in turn produces resistance against powdery mildew (Yokoyama et al. 1991). Therefore, the present investigation was undertaken to study the effect of plant extracts on induction of resistance against Fusarium wilt in tomato. Materials and Methods The present investigation was undertaken during 2016 2017 at Department of Plant Pathology, C.S.A. University of Agriculture and Technology, Kanpur, India. The pathogen, Fusarium oxysporum f. sp. lycopersici was isolated from diseased plants sample and was purified *Author for correspondence: <samirkrbiswas@rediffmail.com>.

Induced synthesis of defense molecules in tomato (Solamum lycopercicum L.) against fusarium wilt through plant extracts