Bioefficacy of certain neem based formulations against whitefly, Bemisia tabaci Gennadius causing leaf curl disease in tomato.

Among eight neem based formulations tested against whitefly causing leaf curl disease in tomato, nimbecidine proved most promising in minimizing the leaf curl incidence (08.33 and 08.73 %) in both years followed by Neemazal, Neemgold, RD-9-Repelin, Bioneem, Neemark, Neemta-2100 and Achook. Achook was least effective (23.13 and 23.64 % leaf curl incidence), however it was significantly superior over untreated control. The highest leaf curl incidence was recorded in untreated control, which was as high as 35.12 and 36.31 % during both years.