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Background The bio-pesticide abamectin has been used to control a large variety of insects, including Diptera species, attributed to its high toxicity with virtually no residual effects on treated crops. Its low residual effect ensures the survival of natural enemies and other non-target organisms. Imidacloprid is also widely used for insect pest control due to its potency and high insect selectivity in comparison to mammals. On the other hand, diazinon has been applied extensively to control immature fruit fly stages, mature larvae, pre-pupae, and pupae in soil drench application, thus, affecting the whole agroecosystem, including the natural enemies. Results The toxic effects of abamectin and imidaclopride proposed as a replacement for diazinone in soil treatment, were studied against a laboratory strain of the peach fruit fly (PFF), Bactrocera zonata (Saunders) (Diptera: Tephritidae) under field-caged conditions. Five days old PFF pupae were treated by each pesticide. PFF pupae exhibited different levels of susceptibility to the tested pesticides. Non-significant differences in the pupal mortality rates were obtained between imidacloprid (77.52%), abamectin (77.22%), or diazinon (73.89%). Diazinon and abamectin achieved the highest percentages of total mortality (100%), followed by imidacloprid (98.89%). Real mortality rates were mostly concentration-dependent, while the deformed flies rate depended on the chemical sub-group of insecticide and concentration. Additionally, the biochemical studies revealed different acetylcholinesterase enzyme (AChE) inhibition levels caused by the pesticides on the treated flies sampled at 24, 48, and 72 hours post fly emergence. Conclusion The bio-insecticide abamectin is an option to diazinon for the control of PFF pupae. Also, soil treatment might be an alternative for PFF pupae control.

Bio-pesticides alternative diazinon to control peach fruit fly, Bactrocera zonata (Saunders) (Diptera: Tephritidae)