PROPHYLACTIC AND THERAPEUTIC USE OF OILCAKES AND LEAVES OF NEEM AND CASTOR EXTRACTS FOR THE CONTROL OF ROOT-KNOT NEMATODE ON CHILI

Abstract

Bare-root treatment of chilli (Capsicum annuum) seedlings with extracts of decomposed and undecomposed oil-cakes and leaves of neem (Azadirachta indica) and castor (Ricinus communis) provided protection against root-knot disease caused by Meloidogyne incognita. A curative effect was also noted when roots of pre-infected seedlings were given a similar treatment. Suppression of root-knot development was greater in pre-infected (therapeutic use) seedlings than in those inoculated after dir treatment (prophylactic use). Extracts of decomposed materials were more effective than those of undecomposed ones. Moreover, oilcakes and neem were more effective than leaves and castor.