Author(s):

BS Chandel and Hemraj Singh Sengar

Abstract: Experiment were carried to assess insectifuge activity of neem and their derivatives against third instars larvae of Athalia lugens proxima (Klug.) under laboratory conditions. The Neem seed kernel extracts (NSKE), Neem leaf extracts (NLE), Deoiled Neem seed kernel powder suspension (c) and neem based insecticide viz azadirachtin, bioneem, econeem, neemazal, neemarin, nimbecidine, azadirone and neemgold were tested by dry-film technique. The spraying of the insecticidal preparation was done in glass petridishes (10cm diameter) by potters spray tower, using 1.0 ml. of solution per petridish. Five concentrations were tested in three replications, along with over control (Benzene + emulsified water). Ten third instars larvae of A. lugens proxima were released inside each pair of petridishes and allow remaining there up to two hours. After which, they were transferred to the fresh petridishes containing fresh mustard leaves for feeding under control conditions (27 + 2 ^oC temp. 75 + 5% relative humidity). The insectifuge biopotency was assessed and result was arranged in the following descending order on the basis of their respective relative EC₅₀ values i.e. Azadiron > Bioneem > NLE > Neemarin > Neemgold > Econeem > DNSKP > Azadirachtin> Neemazal > Nimbicidine > NSKE and the order of the protectivity on the based on the relative Ec₅₀ values are as: 0.1359 > 0.1531 > 0.1833 > 0.3207 > 0.3208 > 0.6397 > 0.6868 > 0.7124 > 0.7421 > 0.9025 > 0.9554 times least protective, respectively. as Azadiron taken as unit. This paper mainly investigated effect of neem-based formulation third instars larvae of Athalia lugens proxima (Klug.).

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