I read somewhere that these small vanilla smelling trees that are commonly used in cars worked in a chicken coop to keep flies away. So I ordered this pack of 12 and hung one on the screen door of my little chicken coop. I also hung six of them in different places in my small three-stall stable. During the day there were no flies at all. They work like magic! I watched the flies head towards the chicken coop but turned around as they approached the door. They don't even go through the barn door and when my three horses go in to escape the flies they really are free from them. Pros: They work and don't smell terrible. To the best of my knowledge, the scent does not adversely affect animals (in fact, I would not put it on the animal or anywhere else where it could be reached or played with). even a small barn. The smell doesn't last long, but I suspect that's because they have to be completely removed from the plastic wrap, whereas in a car you only ever uncover tiny bits at a time so the smell doesn't overwhelm you. Mine are still working after two months, but the smell has significantly gone. Overall good value for money!
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