I've found a watered down pyrethum and neem mix has been the best thing bar none for gnats and many other pests.
Ok what do ya blokes recommend for some tnuc that has swarms of fucking Fungus Gnats
they been back for a month, me new garden beds are full of them already
there will be millions of them here soon
I mix a spray bottle with a very small amount of both mixed with water and spray the grow zone and underside of all leaves before lights off. Then chuck some pool filter over the medium and repeat every 2 days for a week or so and it does the trick every time.
Make sure you are only doing this before lights off, have fans blowing across your plants and NEVER after week 2 or 3 of flower at the very latest.
Hope that helps mate.
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Edited by monsenior, 08 August 2019 - 08:39 AM.