My big problem this year is mosquitoes. Billions of them. No joke. And they’re the size of house cats… big, hairy, aggressive monsters. You can look out the window of our house and see cluster swarms of them congregating like a small cloud on 4 places of our deck alone, day and night, and the second you step outside they’re on you like heat seeking missiles. Without bug spray, the horses get covered in bumps from head to toe which can’t be healthy. A histamine reacted immune system constantly on high-alert can lead to problems over the long-term.
The most effective home-brew recipe I have is:
1 Litre of vodka (cheapest you can find) or peppermint Listerine… or both.
150 mL mineral oil
Garlic (a whole head per Litre - cut cloves in half to let the juices out)
20 drops each of:
citronella oil
catnip oil
sage (if you can’t find sage, you can use eucalyptus)
A couple sticks of cinnamon.
Mix and apply twice a day.
Store in a dark container or store in a dark place.
If you don’t have foals or pregnant mares you can add cedarwood oil. Cedarwood oil is contraindicated to all pregnant mammals, including human. Some horses are sensitive to cedarwood oil, so you should start slowly and then increase if your horses are okay.
If you happen to live in a zone where the African Daisy (Chrysanthemum cineraria folium) readily grows, pull off 4 or 5 seed pods (after flowering) and crush the seeds and add to your concoction. The pyrethrum oil in the seeds is deadly to bugs, but completely harmless to all mammals. If you add pyrethrum you MUST add mineral oil to your concoction because the oil gets on the bug’s legs/body and this kind of contact with the bug allows the pyrethrum to kill it. Without the oil, it will temporarily paralyze the bug, but it can then recover to fly again.
Individually these things smell nice, but brewed together most definitely do not… but that’s kinda the point. Because of the alcohol, the garlic won’t spoil, so it keeps indefinitely.
In a pinch if I don’t have any sage or catnip on hand, I have brewed really, really strong peppermint tea and added that to the mixture, but it’s not as effective. Alternatively, you could brew a tea with boiling water and steep catnip and sage instead of looking for the oils, although the oils are the most effective.
We have wild prairie sage that grows on our farm in certain dry spots. The bugs hate it. I have taken to braiding it into my horses’ forelocks, manes and tails and it helps too.
Someone on another thread dumped some cedar chips near to where her horses like to hang out and found the bugs disappeared from there.