Freeze effects on insects

[duajones]

While we dont get freezing temps down here often, this year we have had 3 or 4 nights where the temps were below freezing with one night as low as 24. You always here how a freeze will kill insects and I am hoping that is the case with pest like fleas, whiteflies etc. Just wondering how much of an effect one might notice in the absence of pests after a freeze. Also wondering whether whiteflies winter over or just move in later on