Bifent IT is usually watered in after a mole cricket application so the rain most likely just aided you in your control efforts as the immature mole crickets are just under the soil. Info from the Bifen IT product label :To ensure control of sub surface pests including
Mole Cricketsusing low volume treatments, (i.e. less than2 gallons per 1000 sq
uare feet), immediately follow the treatment with irrigation of the treated area with at
least 0.25 inches of water