NEMIC ASSOCIATION AND AVOIDABLE YIELD LOSS IN TURMERIC, Curcuma longa L.
A preliminary survey conducted in five districts of Kerala revealed the association of five genera of plant parasitic nematodes with turmeric. Meloidogyne incognita (Kofoid & White) Chitwood was the dominant species. The other nematodes recorded were Rotylenchulus reniformis Linford and Oliveira, Radopholus similis (Cobb) Thorne, Helicotylenchus sp. and Tylenchorhynchus sp. While the incidence of M. incognita was high in all the districts (67 _ 100%), R. similis .occurred frequently in Ernakularn district and R. reniformis in Thrissur and Wayanad districts. Avoidable yield loss under field conditions was 45.3% due to M. incognita but was only 33.3% in a~ixed infestation of M. incognita and R. reniformis.
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