
If you think you are too small to make a difference, try sleeping with a mosquito. - Dalai Lama
Here in Texas, we're in the middle of the time of year (and of the wettest year on record) when the above maeks all sorts of sense to us. Mosquitos abound, and we take all sorts of precautions to avoid them and to eliminate them.
Once of the things that is done on horse farms and properties is to eliminate all standing water possible. However, we have watering tanks for our horses and cattle - what to do about them? Some folks empty them regularly and scrub them out and clean them and refill them. Quite the chore, and it's hard to stay ahead of the little critters.
A few years back, when I was boarding at a stables that 130 acres divided into paddocks, with water tanks in each paddock, I learned a technique that has served me well since getting my own horse property here in Central Texas. It's a losing battle, anyway, because we have a creek that runs through the property, sometimes mroe lazily than others, but we do our best to eliminate what we can. As it happens, the same tool used to eliminate mosquitos can be used to help keep the tanks clean, as well (as long as you don't insist on them shining, and the horses seem to like them better when they're not so shiny).
It's tiny, it's cheap ($.12 apiece, generally, though you can spend as much as a quarter for one if you want a big one), it's entertaining, it's effective - and it puts no poisons into the environment.
What's the secret? It's goldfish!
Goldfish will not only get rid of mosquito larvae in a trice, before they have a chance to become actual mosquitoes, but they will keep the tank clean, as well.
The trick is to buy a few "feeder fish" at the pet store and put them in a full tank (one that hasn't been just filled with chlorinated water, of course). I usually put 10 in a 250 gallon tank, 5 in a 100 gallon one. They will grow just to the point that there are the right number of "inches" of fish for the number of gallons in the tank, and stop there - unless, of course, one dies or something and then they'll grow some more. If you're really lucky, you'll end up with tiny goldfish, as well, that you might be able to sell back to the pet store- it's been known to happen.
I've put a bunch of feeder goldfish in the evening into a tank that was brimming with mosquito larvae. The next morning, there were, maybe, 10 larvae - by noon, none. Mosquitoes will, of course, continue to lay eggs in the tank, but they never make it.
Once the balance is established, you won't need to feed the goldfish, either. An ecosystem is created in which the horses (and/or cows), water, fish, feed, along with you playing your part by keeping the tank topped off and not messing with it any further than that (you can even hook up an automatic waterer if you want), and the fish feed themselves in the process of keeping the tank clean and larvae free.
And, no, the horses don't "drink" the fish (a question often asked), any more than they "drink" the fish in their normal watering hole, a creek or pond. In fact, with the goldfish, you're returning to a more natural situation than the usual scrub-the-tank-make-sure-there's-not-a-spec of dirt in it routine. The horses, given their options, have told me they like this better.
So, there you have it - cheap, easy, easy on the environment, natural, beautiful - all the things you look for in a solution to the mosquito problem. They'll be with us always, of course, but as the Dalai Lama said, small things DO make a difference. This is one small thing that we can do for our environment that's actually pleasant.