I'm no expert on thrips, but here's what I know.
All insects can develop resistances, and thrips already have (but mainly to chemicals professionals use I think). Rotating is a good idea especially if your thrips are getting out of control, but changing brands is sometimes not enough. The active ingredient must be different, so check the label (getting into technicalities, normally the chemical group must be different, but I don't think that the info is the the labels of stuff us normal people buy). Watch out if your spraying indoors! Some insecticides are pretty toxic.
Also, you need to spray a few times at 10 day intervals to get the newly emerged larvae and adults knowing that they do a complete cycle in less than 2 weeks. (eggs and pupae are unkillable, and anyway pupae are in the medium).
I think that Neem oil and insecticidal soaps are effective as well.
We also have bug zappers at work, and kill tons of bugs, but I never paid attention if it got thrips too. It must zap some. Yellow or blue sticky plates work well too.
Something interesting I learned is that thrips are a natural predator of spider mites! Hope I didn't give you too much info!
Hybrid Mode
