Dos Si Dos #33 - Revisited

Hello. This is the end of week 6 and the beginning of week 7 of flowering. Man, I just can't seem to shake these fungus gnats. I tried mosquito bits, and I'm using traps and I bought some nematodes but the fungus gnats are running amuck. I think I'll try pyrethrin, I can buy it at the local big box store (Canadian Tire). It's a powder I put on the top of the medium. Very non toxic except for bees. I don't have any bees in here just fungus gnats. And the plants don't look their best because of them. Had to get in here last week and tie up the plants that were falling over. The Pink Kush had laid over everything and had to be tied up. The White had leaned over and had to be staked and tied up. The Nova OG is in the corner and hard to get to and not looking happy. I'm sure it's the fungus gnats causing problems. It got to -9 c here last week. Coldest it's been in 40 years with the wind chill facture. It's 12 c here yesterday with lots of rain so most of the snow is gone now. Thanks. Chuck.