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Q&A Home

Curious writes,

Should I mix Demand CS with Suspend SC and Gentrol?

I've seen the ability to mix Gentrol with either Demand or Suspend, but can all 3 be mixed? Seems this would offer the best combo for heavy knock down, lingering kill, and nymph control to potentially pyrethin resistant bed bugs. Also, can you confirm the pyrethrin resistance rumored in bed bug populations?


There are indeed strains of bedbugs that are resistant to synthetic pyrethroid insecticides. Synthetic pyrethroids such as Suspend SC and Demand CS are the man-made versions of natural pyrethrin insecticides such as Exciter or Pyganic Pro. There is no valid reason to mix Suspend SC and Demand CS together, it would not make either product work better or produce better results, though it could make treated areas repellent to bedbugs lessening the effectiveness of the treatment. Both Demand CS and Suspend SC can be mixed with Gentrol IGR for a good knockdown and to break the growth cycle of the bedbugs and their eggs. If you do have a problem with a pyrethroid resistant bedbug population, you should use Phantom and Gentrol together. Phantom is not a pyrethroid, it is from a class of insecticides called pyrrole and there is no known resistance from bedbugs to this product. We also highly recommend that you use an aerosol with a straw attachment such as Phantom aerosol for the small cracks and crevices and a dust such as MotherEarth D for long lasting residual control.

Answer last updated on: 11/07/2010

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