Mortality and repellency of aphids (<i>Aphis gossypii</i> G) to orange peel extract (<i>Citrus sinensis</i> L.) and lemongrass emulsion oil (<i>Cymbopogon citratus</i>)

Abstract Aphis gossypii Glover is an important pest in chili plants that can reduce productivity. This pest can be controlled in a more environmentally friendly way using vegetable pesticides sweet orange peel waste and lemongrass oil emulsion. The study aims to determine the best concentration and application of sweet orange peel waste and lemongrass oil emulsion that affects the mortality of A. gossypii. This research method uses a complete randomized design with testing on leaves consisting of five concentrations (0%, 1%, 1.5%, 2.5%) each with five replicates. The results of the study were analyzed using ANOVA and if significantly different followed by a 5% BNT further test and probit analysis to determine the LC50 and LC90 values. The results showed that orange peel waste and lemongrass oil emulsion had an effect on A. gossypii mortality. Both applications have a high level of repellency, able to kill Aphis gossypii 50% at a concentration of 1,215% orange peel waste and 1,084% lemongrass oil emulsion. The higher the concentration of the extract, the faster the time needed to kill the insect 50% and vice versa.