Effect of Neem Formulations on Reproduction and Oviposition of Rice Hoppers Nilaparvata lugens, Sogatella furcifera and Nephotettix virescens

Three commercial neem formulations viz., Nimbecidine, NG4 and Neem Azal T/S each at 10 ppm azadirachtin concentration, were tested against brown planthopper (Nilaparvata lugens Stål), white-backed planthopper (Sogatella furcifera Horvath) and green leafhopper (Nephotettix virescens Distant) for reproductive inhibition. Antiovipositional activity of Nimbecidine and Neem Azal T/S containing 10 and 50 ppm azadirachtin concentrations were evaluated. All the formulations tested at all the concentrations have shown significant reproductive inhibitory effects, presumably by way of derailing the physiological mechanism of egg development and significant ovipositinal deterrency.