Studies on Disease Complex Incidence of Meloidogyne Javanica and Fusarium Oxysporum F.Sp.Lycopersici on Resistant and Susceptible Tomato Cultivars

Hajji Lobna, Regaieg Hajer, M’Hamdi-Boughalleb Naima and Horrigue-Raouani Najet

 

Full Length Research Paper I Published May,2016

 

Journal of Agricultural Science and Food Technology  Vol. 2 (4), pp.41-48

 

 

ABSTRACT

 

A greenhouse experiment was conducted to evaluate the interactive effects of Meloidogyne javanica and different Fusarium oxysporum f. sp. lycopersici isolates on resistant (Cencara) and susceptible (Riogrande) tomato cultivars. The plant growth and disease severity were evaluated after sequentially and concomitantly inoculation in pot experiment. The results indicated that inoculation of fungus either along with nematode or ten days after the nematode inoculation resulted in significant reduction in fresh weight of shoot and fresh weight of root as well as increase in the wilt incidence compared to plant inoculated with the fungus alone. The simultaneous or nematode prior fungus inoculations enhanced Fusarium reproduction exhibited by browning vascular which increased from 7.20% in single inoculation by Fusarium to 25.71% in concomitant inoculation by two pathogens in susceptible cultivar. Wilt resistant cultivar showed reproduction and Fusarium symptoms when roots were infected by nematode also and independently of inoculation time. Virulent population of M. javanica reproduced similarly in resistant and susceptible cultivar. Combined inoculation of both pathogens increased nematode development in resistant cultivar by 30, 33 and by 112.35% in susceptible one compared to plant inoculated with the nematodes alone. Pots experiment allowed concluding that the incidence and severity of both diseases was related to nematode population and inoculation time.

Key Words: Root- knot nematode, Fusarium oxysporum f.sp.lycopersici, Interaction, Tomato, Resistant and susceptible.
 

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