Survey Of Plant Parasitic Nematodes Of Coconut In India
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1980
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In India coconut is grown in about 1.1 million hectares and 67 per cent of the total area under cultivation is in Kerala. A total of 210 soil samples collected from locations from the root zone of coconut, yielded 29 genera of plant parasitic nematodes viz : Aphelen-chus (7%), Aphelenchoides (3%), Atylenchus (1%), Caloosia (6%), Criconemoides (11%), Dolichodorus (6%), Ditylenchus (9%), Dipt-herophora (2%), Helicotylenchus (50%), Hemicriconemoides (2%), Hemicycliophora (3%), Hirshmanniella (2%), Hoplolaimus (25%), Longidorus (11%), Macroposthonia (3%), Meloidogyne (15%), Neotylenchus (1%), Paratylenchus (2%), Pratylenchus (11%), Para-longidorus (2%), Psilenchus (1%), Radophotus (25%), Rotylenchus (5%), Rotylenchulus (21%), Scutellonema (5%), Tylenchus (3%), Tylenchorhynchus (50%), Trichodorus (4%), and Xiphinema (11%). Though plenty of second stage larvae of Meloidogyne sp. and pre-adult forms of Rotylenchulus sp. were encountered no females of any of these were found within the root tissues. Radopholus similis population was frequently met within the roots showing lesions R. similis infested roots exhibited elongate reddish brown lesions and various intensities of rooting. The maximum R. similis population recorded was 745 g of root during the survey. Maximum R. similis population occurred during September to November and the least during April to June. Therefore surveys for R. similis may preferably be carried out during these peak periods.
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In: Proceedings, PLACROSYM II, UPASI, Ootacamund, 26-29 Jun. 1979. Edited by C. S. Venkataram and others 1980 p-45-49