We've had so much rain for many months and there is ponding water everywhere. I asked my dh to pick up some Dunks in town so I can break them up, toss them in the ponding water. Otherwise, we will be in for some misery soon! The mosquitoes are hatching now that it's warmed up. BTI is species specific and only harmful to mosquito larva. It's a natural-occurring bacterium found in soils and is supposed to be safe to use around other wildlife and even beneficial insects.