Synergistic activity of lemongrass and sesame oils on spinosad: A new approach to control the peach fruit fly; Bactrocera zonata (Saunders, 1841), referring to their effect on the adult biological and protein aspects

Abstract

The peach fruit fly Bactrocera zonata (Diptera: Tephritidae), is considered a major destructive pest for fruits and some vegetables. Toxicity of Spinosad mixtures with each lemongrass (Cymbopogon citratus Stapf) and sesame (Sesamum indicum L.) oils were evaluated against Bactocera zonata (Saunders, 1841) adults in a lab by feeding method. The study proved that mixing LC25 of spinosad with LC25 of the plant oils showed a high percentage of mortalities than using each compound individually. The mixture of spinosad with each lemongrass and sesame oil strongly affected the longevity of males (39.66 and 35.66 days) and females (54.33 and 53.33 days), respectively. Also treating insects with the tested mixtures adversely affected the egg numbers(28.7, 21.3), hatchability (46.66 and 33.33) of the deposited eggs, percentage of pupation (29.0 and 42.0), and percentage of adult emergence (20.33 and 36.66). Fractionation of proteins by SDS-PAGE showed that some protein bands were missed or expressed under stress of the spinosad, lemon grass, sesame oil and their mixtures.