LAUSR

Simple Summary Houseflies (Musca domestica L.) are an important medical and livestock pest that not only annoy animals and humans but can also transmit several human and animal diseases. Synthetic chemical repellents have been the first option for fly management, but most have negative impacts on humans, non-target organisms, and the environment generally. Plant essential oils are active against repelling insect pests and affecting their life cycles. Repellents from these oils are an important strategy as a new, effective, and environmentally friendly alternative for housefly management and reducing disease transmission. We investigated the housefly repellency and storage stability of fennel (Foeniculum vulgare) and anise (Pimpinella anisum) EOs and their combinations using the repellency of α-cypermethrin as a reference. Combinations (fennel + anise; 1:1) were the most effective and stable and more stable repellents than single EOs and α-cypermethrin. Most significantly, all single and combination essential oils were safe for two non-target species: guppies (Poecilia reticulata) and earthworms (Eudrilus eugeniae). The combinations make excellent, natural, and stable repellents for housefly management and are suitable to be developed into environmentally friendly products.