Development of Saponin based Nano emulsion formulations from Phaleria macrocarpa to Control Aphis gossypii

Abstract

Aphis gossypii is one of the most devastating insect pests of agricultural crops due to its polyphagous nature. A sustainable environment friendly method to manage this pest is botanical aphicides because of their easily biodegradability and overall safety. In this study, saponin based nano emulsions from Phaleria macrocarpa with Termul 1284 and methyl oleate /rapeseed oil were formulated and tested against A. gossypii for their efficacy in both laboratory and glasshouse conditions.  Results exhibited that all three formulated nano emulsions effectively suppressed A. gossypii population under laboratory and glasshouse conditions. However, TR3 revealed highest repellency (62%) and mortality percentage (100%) with lowest LC50 (1516 mg-L1) and LT50 (27.50 h), following by TM1 repellency (58%) and mortality percentage (98%) with lowest LC50 (1732 mg-L1) and LT50 (34.43 h). Glasshouse bioassay also revealed that TR3 (Termul 1284+rapeseed oil) and TM1 (Termul 1284+methyl oleate) could suppress A. gossypii population at LC50 values of 2512 and 2904 mg-L1 at 72 hours and LT50 values of 68.7 and 71.2 hours at 10000 mg-L1 respectively. Therefore, these both formulations could be considered as eco-friendly alternative approach in pesticides technology.