Sevin® Insect Killer Concentrate LiquidA little goes a long way. Like, a really long way. Protect your garden and flowers with Sevin Insect Killer Concentrate. Including an easy to use measuring cap, you can measure just the right amount of concentrate for the job. Measure the liquid concentrate using the label application rate of 4 fluid ounces of concentrate per gallon of water. Pour the measured concentrate into your favorite sprayer, add the appropriate amount of water, and mix well.