10 Best Yellow Fly Repellent 2025 in the United States

The Absorbine UltraShield EX is a potent insecticide suitable for repelling yellow flies, among many other pests. The strength of this product lies in its broad-spectrum efficacy, with the ability to kill and repel over 70 species of pests including flies, mosquitoes, ticks, and fleas. This makes it highly versatile for users with multiple pest issues. The formulation is ready-to-use, water-based, and weatherproof, offering protection up to 17 days, which is particularly beneficial for outdoor use in varying weather conditions.

Additionally, it includes sunscreens and coat conditioners to protect animals' coats while keeping pests at bay, making it an excellent choice for use on horses and dogs. This is especially advantageous for pet owners who want to avoid mixing different products. Being made in the USA also adds a layer of quality assurance.

However, the strong formula may pose a risk for pets with sensitive skin, and the scent could be overpowering for some users. Given its 128oz size, it is relatively heavy and might be cumbersome to handle for some individuals. This product is best suited for pet owners and premises needing extensive pest control and not ideal for those looking for a lightweight or fragrance-free solution.

The Farnam Endure Sweat-Resistant Fly Spray is a fly repellent designed for horses, boasting a long-lasting protection of up to 14 days. Its active ingredient, permethrin, is known for its effectiveness in repelling flies, gnats, mosquitoes, ticks, and lice. This makes the spray especially useful for horse owners concerned about Lyme Disease and other insect-borne illnesses. One of the standout features is its sweat and water-resistant formula, which is enhanced by Repelock technology that binds the repellent to the horse’s hair shaft, ensuring it remains effective even in wet conditions. This is particularly advantageous for those dealing with challenging weather or maintaining horses that sweat heavily.

On the practical side, the product is easy to apply and available in a large 128 oz size, as well as smaller options. However, it's a liquid, so it may require careful application to avoid waste or misdirecting it into the horse's eyes, nose, or mouth. The scent is described as pleasant, which is a plus for both the horse and the handler.

In terms of skin sensitivity, the spray appears to be suitable across various life stages of horses, albeit care should be taken to follow instructions, especially when applying it as a wipe. The product's durability under sweaty or rainy conditions reduces the frequency of applications, which is convenient but might necessitate reapplication sooner if the horse is washed or exposed to heavy rain. For those needing a reliable, long-duration fly repellent for horses, especially in adverse weather conditions, this product offers significant benefits, though it requires considerate application to ensure the best results.