“I’ve seen it done effectively in farms in the Caribbean and South America. You can be surrounded by jungles but there are practically no mosquitoes.”
Funny you mention that because in South America the Zika virus is blowing through like a wild fire.
It’s not being done on a large scale because there is no big profit in wildlife management that takes time. It’s only being done on private farms/resorts/estates that stick to organic principles above fast profits.
Short sighted people like to see fast results that come from spraying and chemical makers love the profits. Future consequences be damned.
Once you start spraying, you are killing all natural predators up the food chain and you will forever be dependent on newer sprays. Animals naturally adapt and create balance. Manmade chemicals do not and kill all of them