This is my sole tool against thrips,
http://www.appliedbio-nomics.com/products/cucumeris/
it takes time to figure out the sweet spot for your grow room, right now I order 20 packets a week. Like I said, its not perfect, a different style of growing that most are not willing to learn ...but because I am perpetual, it makes sense to me and I really enjoy growing this way.
I have recently went back to the slow release packets vs the bulk tube.
You want to keep the bran dry, for as long as possible. I can open slow release packets that are still intact 5 weeks later (I generally splash water accidently on them, but if I dont,...) there will still be cucumeris in the packet.
The cucumeris will feed off another bug that feeds on the moldy bran when no thrips are around. I keep the packets following the plants into the budroom, cucumeris will also feed on spidermites. I ll post a picture of my veg room, it looks a little messy but it beats spraying imo.
And know that about 1 month and a half ago I had a bit of thrips outbreak (new batch of soil , or something else, I had a lot of clones and seedlings, too many small pots) and so I decided to try the slow release packets again and so I ll show you a picture and you will see very little thrips damage, all I did was using the cucumeris, I kept starting plants and introducing new soil and kept moving things around and slowly the thrips population went down.
I did completely eradicated the thrips for around 6 months 2 years ago when I used enough slow release packets all at once ... anyway, I m still learning, like everybody else.