Originally Posted by paulobaca
I have read about growers spending several hours in a room with nps strips and getting bloody noses. Bloody noses have been reported in snakes as well (the snake I read about recovered several hours later).
The previous post about Spider mites building tolerance to NPS in a room with open vents is true in my exprnce. I had an vented room and they never worked, no matter how many I put up. They would crawl right next to the strips. Once I sealed my room it was like genocide in there.
In my opinion, NPS strips are most useful in flower when you cant spray them. If you have a problem try to handle chit by leaving a bunch up for 1 week and put them away and keep your chit clean.
One very prestigous botanical researcher I spoke with (a UC Davis Prof) always stessed dosage when I talked to him about chemicals and toxicity.
He would tell me that anything is fatal in high enough dosage, even neem.
I would highly discourage anybody for using them an entire grow based on this principal.
First I would not, nor recommend to anybody, they spend a lot of time in a room with these things unless it's lights on in an open system and you have a good air exchange going. Even then only if you absolutely have to and no reason you should have to. I went into the room just before the lights went off and hung then pulled down when the ventilation kicked on when the lights came on. I also have ALWAYS vented my exhaust outside so would be different if someone is venting filtered air back into the house. While the carbon should clean up a lot I still would not do it.
"Once I sealed my room it was like genocide in there"
That's the only way they are effective in my experience. I used them for a few days a week apart and eliminated a large thrip infestation and the beginning stages of a mite infestation in a friends space. Never used em again cause for starters it's very rare pests ever get into a room I'm dealing with. I take a lot of precautions and pays off. Filtered air, clean clothes, treat and quarantine cuts when I get em from someone, etc.
Yeah that dosage thing is basically referred to as LD50 (the amount of something that is a lethal dose for 50% of the test animals) when testing for toxicity. Problem also is chronic low grade exposure and not just getting hit hard all at once.