Buying ladybugs for biological control of pests can contribute to depleting the ladybug population in the wild and raises other concerns as well. Meanwhile, non-native ladybugs do the same valuable work — eating aphids and other pests that harm crops — but are often cast in a bad light anyway. My guest in this week's encore, Dr. Kaitlin Stack Whitney, an environmental studies scholar as well as a home gardener, explains that non-native insects don't always deserve their bad rap.

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