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Jerry writes

How long is the residual effect Cynoff EC expected to last?

Cynoff EC is a residual pest control product. When used indoors I would expect it to be effective longer than when used outdoors. I read that it should be applied every two weeks for proper control of fleas, but that seems like a very short residual effect. So, how frequently should I treat with Cynoff EC for control of ants, roaches and flies?


Cynoff EC can be expected to last up to 30 days outdoors and up to 60 days indoors.  UV light and rain outside can deplete the residual outside, but UV light is the main culpret.  If one side of your home is in direct sunlight all day, then you may only get 3 weeks out of the product.  For fleas specifically it is a good idea to treat once and then again exactly two weeks later because fleas hatch every two weeks and your chances are better if the product is stronger than weaker.  After the first two treatments you should be able to only apply every 30 to 60 days for maintenance control. 

Answer last updated on: 06/18/2010

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