Asian Journal of Plant Pathology1819-1541xxxx-xxxxScience International10.3923/ajppaj.2010.1.15Meloidogyne incognita in Four Species of Cucurbits]]>ChandraP. SaoR. GautamS.K. PoddarA.N. 1201041Root knot nematodes are responsible for tremendous amount of crop loss in Cucurbits. Hence, pot culture experiments were conducted under greenhouse conditions to study the effect of population density on the pathogenic potential of M. incognita in Lageneria ciceraria, Cucumis sativa, Momordica charantia and Cucurbita pepo. The 10, 100 and 1000 second stage juveniles (L2) were inoculated into the rhizosphere of 15 day old seedlings and percent changes in the growth parameters of infected plants vis-avis control recorded manually, after 30 and 60 days along with the number of root galls and final nematode population extracted from roots and soil. Estimation of RGS and rate of reproduction was calculated by standard methods from the data obtained. Statistical significance of the means was analyzed by ANOVA using Ms Office Excel. All the four cucurbits were found to be highly or moderately susceptible to infection with M. incognita and population growth of the nematode was found to be a determining factor in the pathogenesis of the infection. A general response was a disturbance in the plant growth pattern due to limitation in water and nutrient translocation from infected roots to above-ground plant tissues. An inverse relationship was found to exist between population density, population growth and severity of root galls. The on set of galls has been considered to be a protective measure of the plant for restriction of parasitic movement and maintenance of stable parasite population. The root knot nematodes have been considered to use both r and k strategies for their efficient survival and perpetuation of species depending on inter and intra-specific competition prevailing.]]>Barker, K.R. and T.H.A. Olthof,1976Di Vito, M., N. Greco and A. Carella,1986Meloidogyne incognita and importance of the innoculum on the yield of eggplant.]]>Di Vito, M., F.N. Lamberti and A. Carella,1979La resistenza del pomodoro nei confronti dei nematodi galligeni:Prospective e possibilita.]]>Di Vito, M., N. Vovlas and P. Castillo,2004Meloidogyne incognita on Spinach.]]>Gergon, E.B., S.A. Miller, J.M. Halbrend and R.G. Davide,2002Giri Babu, P., R.V. Singh and A.D. Munshi,2008Meloidogyne incognita Race 1) on Ridge gourd (Luffa acutangula)and Sponge gourd (Luffa cylindrica).]]>Jain, S.K., G.S. Dave and A.K. Jain,1994Heterodera cajani on black gram.]]>Jain, R.K., K.N. Mathur and R.V. Singh,2007Khan, T.A. and S.I. Hussain,1990Meloidogyne incognita and Fusarium solani on seedling emergence of papaya seedlings.]]>Khan, T.A., S. Nisar and M.S. Ashraf, 2004Meloidogyne javanica on plant growth and nematode multiplication on cucurbits.]]>Khan, M.R.,2003Meloidogyne incognita race 2 infecting Balsam (Impatiens balsamina L.).]]>Khan, T.A., M.S. Ashraf and S. Hasan,2006Meloidogyne javanica on Balsam (Impatiens balsamina).]]>Kumar, M. and K.N. Pathak,2005Meloidogyne incognita on germination, seedling emergence and plant growth of lettuce, Lactuca sativa Linn.]]>Liebanas, G. and P. Castillo,2004MacArthur, R.H. and E.O. Wilson,2001Ogunfowora, A.O.,1977Meloidogyne incognita on the yield of Tomato (Lycopersicon esculentum) in the southwestern Nigera.]]>Parry, G.D.,1981Parveen, K., A. Haseeb and P.K.l. Shukla,2006Meloidogyne incognita on Mentha arvensis cv. Gomti.]]>Patel, M.B., D.J. Patel and B.A. Patel,1996Meloidogyne incognita and M. javanica on cotton.]]>Pathak, K.N., N. Keshari and M.G. Hyder,2000Meloidogyne incognita on seed germination, seedling emergence and plant growth of cauliflower.]]>Rakesh, P., A. Hasseeb and A. Hussain,1992Meloidogyne incognita on Mentha aruensis CV MAS-1.]]>Sukh Deo, M.V.K. and L. Chapell,1994Vovlas, N., G. Lucarelli, N. Sasanelli, A. Troccoli, I.C. Papajova, J.E. Palomares-Rius and P. Castillo,2008Meloidogyne incognita on Celery.]]>Wallace, H.R.,1973Zitter, T.A., D.L. Hopkins and C.E. Thomas,1996Southey, J.F., 1986McGrath, M.T.,2004Lewis, S.A.,1987Hussey, R.S. and V.M. Williamson,1997Horn, S. and D. Rubenstein, 1984