Fungus gnats in dwc.

[baldwindabs]

I have 4 plants going right now 5 weeks into flower and I have some fungus gnats in my grow room and there is now larvae in my reservoirs. I picked up some 35% peroxcide from my local hydro shop will it work? How much do I use per gallon of water?

 

[Kcrop]

I believe its one part peroxide to 4 parts water.

 

[hotrodharley]

I have 4 plants going right now 5 weeks into flower and I have some fungus gnats in my grow room and there is now larvae in my reservoirs. I picked up some 35% peroxcide from my local hydro shop will it work? How much do I use per gallon of water?

http://www.organicagardensupply.com/disease-pests/using-h2o2-in-your-hydroponics-garden/

 

[my_second]

I believe its one part peroxide to 4 parts water.

Hi; I believe @Kcrop 's advise of 1:4 ratio is for 3% H2O2. @baldwindabs is using 35% H2O2; 1:4 would obliterate the plant.

@hotrodharley 's article mentions going as high as 5 ml in a gallon of water. At 35% H2O2, that works out to about 0.046% H2O2 concentration. I don't know absolutely if that is optimal, but that's close to what I did when I had mild root rot, and it worked. I wish you good luck.