Coverage is important, because the oil needs to contact the insect in order to get satisfactory control. Many other insects spend the winter in protected places in, or around the home garden or orchard. Crop debris, old trash and rubbish, loose bark and dead branches or twigs are some of their favorite wintering spots. To destroy these insects and lower your insect problem next season keep your garden or orchard neat and tidy. The crop debris you collect in your clean-up efforts, unless heavily infested with insects or diseases, is great material for the compost bin.
Some folks also take additional steps to reduce insect populations in their garden soil.
Tilling this time of year will help expose buried pests to winter temperatures. Tilling for insect control makes good intuitive since, but I haven't seen any research that shows how effective it is as an insect control measure. The organic matter will start to break down, and who knows maybe the insects will freeze. Even if this tillage technique doesn't kill many insects, I like the idea of sleeping under the warm sheets of my bed while visions of freezing insects dance through my head.