Product Q&A

« See More Q&A's

Thomas from Cumberland, Ri writes

How soon will combination of Onslaught and Gentrol start working on modest indoor flea infestation?

Judging from the label I assume that combination is allowed to be used as a broadcast, correct?


You should see results within 24-48 hours of the application. You will notice that the larger adult fleas are gone but you will continue to see the small immature fleas as they come out of their cocoons. These immature fleas will not be able to reach sexual maturity because of the Gentrol and will eventually succumb to the effects of the Onslaught. You will need to vacuum every square inch of carpet immediately before the application and for every day after the application for about 14 days. After 14 days a repeat application should be made to get rid of any stragglers. You should note that Gentrol IGR cannot be used outside as it is not photostable. If you do need to treat inside as well as outside for fleas you can use Martins IGR mixed with Onslaught and you can purchase them together in our Outdoor/Indoor Flea Kit.

Answer last updated on: 10/18/2011

Was this answer helpful to you? Yes No

5 of 6 people found this answer helpful.

Onslaught Insecticide

Onslaught Insecticide

4 out of 5 stars

On Sale!
Was: $69.98

Free Shipping*