Voted Best Answer
Nov 16, 2018 - 03:32 AM
It sounds to me like the problem is that the Bifen and or Permethrin is over diluted. If you want something a little stronger, try Bifen XTS. It contains Xylene which gives a real kicker to the Bifen.
As far as different chemicals go, in most cases you would want to change chemistry. Bifen and Permethrin are both pyrethroid class chemicals. In order to change chemistry you would need to use something that is not a pyrethroid. Temprid contains Imidichloprid which is a neonicitinoid (different chemistry than pyrethroids). Dominion 2L also contains Imidichloprid.
My advice is to keep spraying something, but whatever you spray unless you have a way to mix it properly in a large spray tank, you will have to apply by hand. The rate is usually 1 oz of chemical per gallon of water - per 1,000 square feet. So if your lawn is 5,000 square feet you will need roughly 5 gallons of diluted spray.
Hope this helps.