Warble flies can be a persistent nuisance around outdoor trash cans, but there are several effective strategies to keep them at bay. First, ensure your trash cans have tight-fitting lids to block access. Regularly clean the bins with disinfectant to eliminate odors that attract flies. Using natural repellents like essential oils (e.g., eucalyptus or peppermint) can deter warble flies. Additionally, place trash cans away from high-traffic areas and direct sunlight, as heat accelerates decay and attracts pests. For long-term prevention, consider installing fly traps or applying eco-friendly insecticides around the bin area. By maintaining cleanliness and using proactive measures, you can significantly reduce warble fly infestations.