Answer: They were brought in to control pests such as those found in orchards and they will eat aphids in your garden, too. As you have seen, these ladybugs converge in preferred locations such as a warm, sunny western wall and then shelter in crevices (attics are a favorite spot)for the winter. In spring they emerge and disperse. If you have some in your yard or general area now, then they will be in the vicinity in the spring. They will come to your aid if ever there is a sufficiently heavy aphid infestation. The secret to attracting the ladybugs is to allow the infestation to build naturally, then at what seems like the last minute they arrive and do their job. In my experience, they must be pretty effective because I have lady bugs in my attic and have not seen an aphid for years. Finally, it is a good idea to caulk every possible gap on your house because they become very pesky when they get in.
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