Plants Getting Killed

I HAVE SOME PLANTS THAT ARE PRETTY GOOD AND THE HAVE FUNGI KNATS. I WAS JUST WONDERING WHAT TO DO ABOUT THIS IF YOU KNOW TELL ME PLEASE!!!

go to home depot and buy organic bug killer by plant stuff its like a soapy waxy mix spray them let it chill wash them later.....might take a couple times also a smart thing to do ppl dont realize is to use like bone meal and blood meal because it atracts predatory bugs which will eat your bug problem and at the same time make the bugs b like shit better not come back.....at least thats my experience but watch out because i ended up attracting alot of mosquitos

thanks no one would answer me thanks a bunch.

lower the humidity in ur growspace aswell. using pestesides is just gunna delay ur problem...as long as its too moist they will keep coming back