Comparative Efficacy of Essential Oils, Synthetic Insecticides and Beltsville Bait against the Housefly Musca domestica L. (Diptera: Muscidae) under Laboratory and Field Conditions in Punjab, Pakistan

The housefly, Musca domestica L. (Diptera: Muscidae), is a cosmopolitan synanthropic pest of major public-health and veterinary significance, capable of mechanically transmitting more than one hundred pathogens.The intensive use of broad-spectrum chemical insecticides for its control has selected widespread resistance and raised concerns about non-target toxicity, prompting renewed interest in plant-derived insecticides and integrated approaches.The present study was conducted in District Gujranwala and Lahore, Punjab, Pakistan, to evaluate and compare the bioefficacy of two essential oils (Cedrus deodara [cedarwood] and Eucalyptus globulus [eucalyptus] at 10, 15 and 20 % v/v), four synthetic insecticides (acetamiprid, cypermethrin, imidacloprid and lambda-cyhalothrin at 500-1000 ppm) and an insecticide-free Beltsville attractant bait.Bioassays were performed under laboratory (indoor) conditions on a laboratory-reared strain and replicated under field (outdoor) conditions at a cattle facility using a baited attraction evaluation device.Knock-down and mortality were recorded at fixed intervals and analysed by probit (EPA Probit v1.5) and analysis of variance (Statistix 8.1; CRD-factorial; means separated by LSD at α = 0.05).Eucalyptus oil at 20 % produced the highest knock-down (63.32 %) and mortality (66.66 % after 12 h), with LC50 = 10.08 % and KT50 = 6.42 min, significantly outperforming cedarwood oil (LC50 = 18.33 %; KT50 = 10.61 min).Among insecticides, imidacloprid was the most effective indoor (LT50 = 2.03 h at 1000 ppm), whereas cypermethrin produced the highest outdoor mortality (50.67 % at 1000 ppm after 12 h; LT50 = 0.12 h).The Beltsville bait achieved 53 % mortality after 8 h through dehydration, despite containing no insecticide.The findings demonstrate that essential oils and dehydration-based baits are viable, environment-friendly components of an integrated programme for M. domestica management in rural Punjab, and can substantially reduce reliance on conventional neurotoxic insecticides.