Malathion susceptibility and biochemical profiles in agricultural and urban populations of Musca domestica (Diptera: Muscidae)
DOI:
https://doi.org/10.21829/azm.2026.4212860Keywords:
Musca domestica, malathion resistance, biochemical resistance mechanisms, detoxification enzymes, acetylcholinesterase, glutathione S-transferase, cytochrome P450, agroecosystemsAbstract
The house fly, Musca domestica L., is a synanthropic species of public health and veterinary importance whose recurrent exposure to insecticides may promote the development of resistance. The objective of this study was to evaluate malathion resistance and characterize the activity profiles of enzymes associated with resistance mechanisms in M. domestica populations collected from a mango orchard and an urban waste disposal site in Tapachula, Chiapas, Mexico. Susceptibility to malathion was evaluated using topical application bioassays and Probit regression, with a susceptible strain used as the toxicological reference. Basal activities of acetylcholinesterase (AChE), α- and β-esterases, esterase activity measured using p-nitrophenyl acetate (pNPA), glutathione S-transferases (GST), and cytochrome P450-dependent monooxygenases were also determined in the two field populations. The agricultural population showed the lowest susceptibility to malathion, with an LD₅₀ of 10.65 µg a.i./fly and an LD₉₀ of 61.01 µg a.i./fly, corresponding to resistance ratios of 5.28 and 6.00, respectively. In the urban population, the LD₅₀ was 5.13 µg a.i./fly and the LD₉₀ was 31.65 µg a.i./fly, with resistance ratios of 2.54 and 3.11, respectively. Esterase activity measured using pNPA was significantly higher in the agricultural population, whereas AChE, GST, and P450 activities were higher in the urban population; α- and β-esterase activities did not differ significantly between populations. These results demonstrate different levels of malathion resistance and distinct biochemical profiles between the populations studied. These findings highlight the importance of integrating toxicological bioassays and biochemical analyses into resistance surveillance and management programs for M. domestica.
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