Originally Posted by caljim
Gnatrol WDG, yellow sticky traps. Use both regulary and with a little patience your gnat free. Idk why people mess with anything else.
If you believe they are laying dormant in your compressed brick, add it to your final flush water when rehydrating your brick.
The problem ive found with this is that gnatrol only kills larvae at a specific stage in the life cycle that lasts about a day, and they stay larvae for 30 days before maturing and laying eggs for a few days, so you have to use gnattol every day for a month in coco daily feeding to even have a chance at breaking the life cycle, and thats not counting that there are bti resistant gnats because of monsanto corn stock that produces bti to try to keep corn borers off. Nothing is immune to boiling water, its cheap and kills all life cycles instantly. Works on aphids and thrips that might be hiding in there also, where as sm90 and gnatrol wont