Abstract
The root-knot nematodes (Meloidogyne species) are economically important pathogens, especially infesting vegetable crops. In the tropics and subtropics, Meloidogyne incognita causes an estimated yield loss of 5 to 43% in vegetable crops. In the present study, root-knot nematode disease was surveyed in various vegetable crops in the central plain region of Chhattisgarh State. Roots and rhizosphere soil samples were collected from 44 farmlands representing five districts of Chhattisgarh during mid cropping season. Nematodes were extracted by Cobb’s sieving and decanting method, followed by modified Baermann’s funnel technique. Out of 44 samples, 24 showed the root-knot nematodes infection with an overall incidence of 54.54%. The percent incidences of disease ranged between 30 and 80% in five districts. Out of 13 species of vegetable crops surveyed, nine were observed to be infected. The most frequently occurring species was Meloidogyne incognita (63.33%), followed by Meloidogyne arenaria (20%) and Meloidogyne javanica (16.67%). Maximum frequency was observed in Lageneria siceraria (100%), and least was Musa paradisiaca, Daucus carota and Amaranthus tristis (50%). The mean population density of 2nd stage nematodes ranged between 766 and 9076 nematodes/200 cc soil and 10 g roots in samples. Key words: Root-knot nematode, survey, Meloidogyne spp., incidence, frequency, Chhattisgarh.
Highlights
The state of Chhattisgarh is situated between 17-23.7°N latitude and 80.40-83.38°E longitude in the central eastern part of India with a population of more than 20 million and total geographical area of 136.03 thousand sq. km
A field survey of various villages belonging to the five districts of central plains of Chhattisgarh was conducted during SeptemberFebruary, 2011-2012 and 2012-2013 to determine the root-knot nematodes (Meloidogyne spp.) associated with various vegetable crops
44 samples belonging to 19 farmlands and 13 different vegetable crop species were collected during survey
Summary
The state of Chhattisgarh is situated between 17-23.7°N latitude and 80.40-83.38°E longitude in the central eastern part of India with a population of more than 20 million and total geographical area of 136.03 thousand sq. km. The state of Chhattisgarh is situated between 17-23.7°N latitude and 80.40-83.38°E longitude in the central eastern part of India with a population of more than 20 million and total geographical area of 136.03 thousand sq. It is divided into three agro-ecological regions on the basis of topography; they are the Northern Hills, the Central Plains and the Bastar Plateau. The central plain known as Chhattisgarh plain includes the districts of Raipur (capital), Mahasamund, Dhamtari, Durg, Rajnandgaon, Kabirdham, Bilaspur, Korba, Janjgir and a part of Kanker (Narharpur and Kanker block) along with a part of Raigarh.
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