Toxicological and Histopathological Effects of Lemongrass Oils on Oleander Aphids (Aphis nerii)

This study investigated the potential of lemongrass oil as a natural insecticide against oleander aphids using microscopic analysis of treated specimens. The findings revealed progressive damage to the aphids' internal tissues over time, with increasing severity at higher oil concentrations. This damage included tearing of the exoskeleton, compromising their defense mechanisms, shrunken salivary glands and dilated midgut, indicating impaired feeding and digestion, and even separation of organs, suggesting widespread cell death. These results strongly support the toxic effect of lemongrass oil on oleander aphids and its potential as a dose-dependent insecticide. Further research is recommended to optimize application methods, minimize environmental impact, and elucidate the underlying mechanisms of action, including potential effects on the aphid cytoskeleton.