Malathion, methoxychlor, ro- tenone, or pyrethrum (
How long does it take malathion to kill fleas?
To prepare the mixture you need to mix 5 ounces of the chemical in a gallon of water. Apply the mixture using a spray onto the areas affected by flea infestation. The effect of the activity can last over 3 weeks. You need to give at least 4 hours to the applied area to dry.
What is the best insecticide to kill fleas?
Get Rid of Fleas Outside
For short term results (but faster results), a recommended insecticide to kill the adult fleas is Bifen IT. Mix at the rate of 1 oz. per gallon of water.