Rick from Merritt Island writes
You can use Bifen XTS every two weeks as needed to treat for chinch bugs. The Bifen XTS product label also recommends: To maximize efficacy against sub-surface pests, apply Bifen XTS with a nonionic surfactant in enough water to ensure the spray penetrates to soil-thatch matrix. Water treated areas with 0.25 to 0.5 inches of water immediately following application, taking special care to prevent run-off or puddling.
Answer last updated on: 09/21/2011