Just sprayed mine yesterday evening. I use Bifen IT, can get it at the feed stores. About $70 a gallon, but 1 oz. of Bifen makes 1 gallon of spray. I spray twice a year using a lil boom sprayer on my 4 wheeler. If there's a mound. I treat it by spray soaking the mound good, then swap over to the boom and spray everything I mow. I use to constantly fight ant piles spending $$ on treating all those mounds. Found out treating the whole yard does the trick. That stuff gets in the dirt and they don't like it.
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