Effect of chemicals and a phytotherapeutic substance on biological phenomena of Meloidogyne javanlca infesting tomato

Effect of two granular nematicides (aldicarb and carbofuran, each @ 1 mg a.i./kg soil) and castor leaf extract (@ 40 g/kg soil) was studied on hatching, penetration, life-cycle development and oviposition of Meloidogyne javanica. In vitro studies on hatching revealed that maximum reduction in population over control occurred with castor leaf extract. With regard to larval penetration in tomato roots, chemicals were more effective at all intervals (24, 48, 72 and 96 hrs after inoculation) as compared to castor leaves. Studies on life-cycle development indicated that in both treated and untreated tomato plants, the time required for its completion was 27 days (from larva to larva). Oviposition in treated plants was markedly reduced as compared to control.