Abstract
Root knot nematodes (Meloidogyne species) are major pests of vegetable crops causing serious losses in quantity and quality of crop yield. This study involves an assessment of their suitable hosts on the basis of variations in their population densities and body sizes in different vegetable crop plants under field conditions. A random survey of root knot nematode infestation in vegetable crops was conducted in 9 villages of Abhanpur block, Chhattisgarh state, Central India, from January 2012 to March 2012. Diseased plants were identified on the basis of above ground symptoms and soil and root samples collected by digging. Extraction of nematodes was done by Cobb’s sieving and decantation method and Baerman’s funnel technique. Identification was done microscopically by morphological examination of perineal patterns of female nematodes. Body sizes were measured by using an eyepiece/ocular micrometer. Twenty nine percent of the total farm area surveyed suffered from root knot nematode attack. Among the several genera of vegetable crop plants surveyed, Lycopersicon esculentum, Dolichos lablab, Solanum melongena, Momordica charantia, Daucus carota,Capsicum annum,Cucumis sativus had root galls. Three species of root knot nematodes Meloidogyne incognita, M. javanica, M. areneria were identified from the above hosts and a comparative morphometric analysis of the body, head and neck size ratios of females were done. Non-significant body and head size variations existing between the females from D. lablab, S. melongena, C. annum, D. carota, L. esculentum showed that all the crops are equally susceptible to root knot nematode attack. However, on the basis of nematode population density, D. carrota appears to be the best suitable host of the Meloidogyne species other than L. esculentum and S. melongena.
Highlights
Root knot nematodes (Meloidogyne spp.) characterized by pear- shaped females are widely specific parasites attacking almost every species of higher plant
Identification of suitable hosts for root knot nematodes on the basis of galling index, population density and reproduction factors have been done (Davide, 1980; Davis et al 1992; Zhang and Smith, 1994; Araya and Caswell-Chen, 1994; Cervantes-Flores et al, 2002; Adegbite et al, 2005; Saleh et al, 2009; Gutiérrez-Gutiérrez et al, 2011 and Sajid et al, 2011).This study involves an assessment of the suitable hosts for root knot nematodes on the basis of their population density and morphological size variations in different vegetable crop plants under field conditions
Medium population densities were observed in A. viridis (1716) in village Mura; C. sativus (1260) in village Chatoud and L. esculentum (1458) in villages, Chatoud, Khursenga, Birejhar, and Gatapar
Summary
SUITABLE HOSTS OF ROOT KNOT NEMATODE ATTACK: AN ASSESSMENT ON THE BASIS OF MORPHOLOGICAL SIZE VARIATIONS AND POPULATION DENSITY UNDER FIELD CONDITIONS. Poddar Parasitology Laboratory, School of Studies in Life Sciences, Pt. Ravishankar Shukla University, Raipur, 492010, CG, India
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