Appraisal of losses due to root‐knot nematode,Meloidogyne javanicain okra under field conditions

Studies were conducted during May 1984 on estimation of losses in okra under field conditions naturally infested with Meloidogyne javanica. The yield of okra was reduced at population levels of 296 ± 5 Meloidogyne javanica larvae per 250 g soil. Percentage avoidable losses in yield ranged from 20.2 to 41.2% by using carbofuran and aldicarb at 2.0 and 4.0 kg. a.i./ha respectively. Aldicarb gave better results than carbofuran at both the doses. Cost‐benefit ratio was found maximum (1:11.7) with aldicarb at 2.0 kg a.i./ha whereas it was minimum (1:1–8) in carbofuran treated plots at 4.0 kg a.i./ha.