I have 4 citrus and 2 Poms that I will have to bring indoors for the winter.
What do we do about any insectoids that took up residence in the potting soil over the summer.
One method is to find a large tub that the whole pot will fit in. Fill it with water and submerge the plant, and the pot in the tub. I have never done this, and I would think you may lose some soil. But many gardener's do this. Keep in there for 5-10 minutes. Any bugs will die. The plant will be well watered, but should be fine! No chemicals!
I live in MI and I usually bring my pots in very late just before frost, and most insects have left or are dead already.
I was planning a series of hort oil sprays for the leaves and trunks but was stymied by what to do with the soil.
The problem I have every year is spider mites, which seem to be inside pests, not outside, at least I never see them while the trees are outside. Spritzing them regularly with water helps keep them off.