Effect of neem extracts on activity and mortality of second-stage juveniles of Meloidogyne incognita

Vijaylaksmi Mojumder, Anju Kamra, Prem Dureja

Abstract


Three chemicals obtained from neem, viz. azadirachtin, nimbin and salannin reduced the mobility of second-stage juveniles of Meloidogyne incognita and caused 17.5, 16.8 and 18 per cent mortality, respectively after 48 h. They also decreased penetration of the roots of mungbean seedlings to 9, 9.8 and 0.8 per cent respectively compared to 22.8 and 22 in untreated and treated after 7 days. Salannin at 1000ppm was the most effective causing 76 and 86 per cent immobility; 9 and 18% mortality at 24 and 48 h exposure, respectively and significantly reduced the number of juveniles that penetrated mungbean seedlings ( < 1 J 2 / plant). Azadirachtin and nimbin resulted in more than 50 per cent immobility at 48 h of exposure.

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