National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A survey was conducted to explore the existence of plant parasitic nematodes associated with millet crops in Tiruvannamalai District. In this study, nine genera of plant-parasitic nematodes were recognized. The analysis of nematode communities revealed that the Tylenchorynchus sp. was the most frequently occurring nematode having an absolute frequency of 46.6% followed by Helicotylenchus sp. (38.8%) and Meloidogyne sp. (25.9%). These were followed by Pratylenchus sp. (23.3%), Hoplolaimus sp. (20.7%), Criconemoides sp. (6.0%), Heterodera sp. (4.3%) and Rotylenchulus sp. (3.4%). Trichodorus sp. was least frequently occuring species (2.6%). The maximum absolute density was recorded for Tylenchorynchus sp. followed by Meloidogyne sp. and Helicotylenchus sp. with 300, 225 and 122 individuals per 200cc soil respectively. Considering both frequencies and densities, the highest prominence value of 52.0 was recorded for Tylenchorhynchus sp. followed by Meloidogyne sp. (33.8), Helicotylenchus sp. (13.5) and Pratylenchus sp. (10.1). These were followed by Heterodera sp. (7.3), Hoplolaimus sp. (5.1), Trichodorus sp. (4.1), Criconemoides sp. (1.0) and Rotylenchulus sp. (0.3).Of these, root-knot nematode (Meloidogynespp.) in little millet at Jamunamarathur and Tiruvannamalai blocks and cyst nematode (Heterodera sp.) in kodo millet at Tiruvannamalai block were very important genera.
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