Bio-efficacy of commercial formulations of neem for the management of grasshopper complex of Sehima-Heteropogon dominated grass cover.
The efficacy of 4 commercial neem (Azadirachta indica) formulations against the grasshopper complex (Acrida exaltata, Chrotogonus tachypterus, Locusta migratoria, Poecilocerus pictus [Poekilocerus pictus], Schistocerca cancellata and Schistocerca gregaria) of Sehima- and Heteropogon-dominated grass cover was evaluated during the kharif seasons of 1997 and 1998 in Jhansi, Uttar Pradesh, India. The neem formulations Achook, Jawan, Bioneem and Suneem were applied at 0.2, 0.2, 0.35 and 0.5% concentrations. Treatments with malathion at 0.075% and water were used as the recommended and untreated control, respectively. All neem formulations recorded significantly lower leaf damage and higher green forage yield over the untreated control. However, among the different neem formulations, Achook recorded the lowest leaf damage (3.12%), the highest green forage yield (8.76 t/ha) and the highest yield increase over the untreated control (2.18 t/ha or 33.13%) over the 2-year study period.