بررسی توانایی اسانس اسطوخودوس ( (Lavandula angustifolia برای کنترل لارو مگس خانگی

House flies (Musca domestica) are a mechanical vector for over 100 pathogens (such as fungi, bacteria, viruses, and parasites), some of which cause serious diseases in livestock and humans. Chemical pesticides are commonly used to control houseflies, but their compatibility with sustainable agriculture is questionable. Fortunately, there are alternative approaches, such as using phytogenic compounds. There are some reports that show lavender species have larvicidal effects against some insects. However, plant species, geographical conditions and type of insects have effects on lethal dose of essential oils. In the present study, larvicidal effects of Lavandula angustifolia essential oils, (dissolved v/v in ethanol 60% at concentrations of 0, 1, 1.5, 2, 2.5, 3, 3.5 and 4%) were evaluated against house fly larvae. Analysis of essential oils using GC-MS identified linalyl acetate, linalool, and alpha-pinene as the major compounds with 27.8%, 18.8%, and 16% concentrations, respectively. The larvae were 3rd instar Musca domestica and five replicates with 25 larvae per replicate were used at each concentration. Larvae were dipped for 1 min and transferred to a plastic container filled with 25 gr of a medium containing finely crushed wheat barn, alfalfa, milk replacer and bakery yeast. The number of live larvae was counted after 24 hours. Live larvae were kept in the containers until emerging flies appeared, then the flies were enumerated. Lethal concentration LC50 and LC90 were calculated using probit regression using SPSS software (version 26). The LC50 and LC90 were 3.2 and 5.5 percent, respectively. Control (24 ± 1.2) showed the highest, whereas 3.5% (9 ± 1.5) and 4% (0.4 ± 0.8) essential oil-dipped treatments showed the lowest number of survived flies (P<0.05). It seems that higher linalool concentration is responsible for having better larvicidal effects, but the impact of interaction between linalool and other major or minor compounds on larvicide properties needs more studies. In conclusion, results suggest a promising role for essential oils of Lavandula angustifolia as a potent compound in controlling musca domestica larvae. However, additional research is warranted to fully explore their potential economic benefits and method of implementation.