We buy the bio safe donuts and the crumbly stuff and spread it with a de ice spreader in the fields. We use the donuts in standing water. Literally takes care of them all for a while until they bloom again and we have to reapply. We have a swamp in the first 5 acres of land. All of it gets biological mosquito killer, also kills all eggs it comes into contact with. This stuff is the bees knees when it comes to taking care of them. Lots of this 
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