Biological activity and safety evaluation of monoterpenes against the peach aphid (Myzus persicae Sulzer) (Hemiptera: Aphididae)

Abstract The green peach aphid, Myzus persicae (Sulzer) (Hemiptera: Aphididae), is an economically important cosmopolitan crop pest. Essential oils (EOs) are complex mixtures of secondary metabolites that exhibit a wide range biological activities, including antioxidant, antimicrobial and anti-inflammatory activities. Monoterpenes, as the major constituents EOs, well known for having In this study, 9 monoterpenes were screened fumigant toxicity against M. , safety to natural enemies was evaluated. results bioassays indicated showed promising . Carvacrol most toxic compound based on LC 50 value, which 1.566 mg/L, followed by bornyl acetate, terpinolene, terpinyl had higher toxicities towards aphids, with values 2.648 2.759 2.832 respectively. addition, evaluation assays carvacrol Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) larvae (LC = 43.851 mg/L) did not affect nontarget invertebrates at concentrations effectively controlled aphids. safer than chlorpyrifos enemy H. (toxicity ratio 28.00 > 2.93). These identified several high-activity can be used pest in greenhouses botanical insecticides.