Therapeutic and preventive nematicidal activity of aqueous neem leaf extract on Meloidogyne incognita and growth of tomato
2011
Harpreet Kaur, | Kaur, Harjinder | Rishi, Praveen
Results indicated that 100% concentration of aqueous neem leaf extract gave 100% J₂Meloidogyne incognita mortality after 48hrs of exposure. After treatment with 75% at12 hrs and 24 hrs, 50% at 12 hrs and 24 hrs, 25% at 72 hrs less than 50% immobile J₂ were revived when immersed in distilled water in comparison to 100% revivability in controls. Percentage of viable J₂ was decreased with increase in exposure time from 12 hrs to 72 hrs in each concentration. Application of 100% concentration of aqueous neem leaf extract in potted tomato plants prior to the inoculation of J₂ (plant + neem + nematode) resulted in significant (< 0.05) reduction in total number of females / root system, number of galls / root, number of females / gall and number of nematodes (males + J₂) / 250g soil as compared to control-2 (plant + nematode). Preventive treatment gave significant enhancement in various growth parameters such as total fresh weight of root and shoot (20.46±5.71 and 43.88±12.72) in tomato as compared to therapeutic group (18.76±4.9 and 38.14±11.05). The fruit yield was also significantly better in preventive than in therapeutic group.
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