Ladybugs eat aphids. So if aphids are eating your potato plants, you might be tempted to mail-order a ton of ladybugs (yes, this is a thing you can do) to solve your garden woes. There's a flaw in that plan, though: When you release ladybugs, they fly away.
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Nobody likes mosquitoes, but the mosquitoes sure do love us. Spraying your skin with DEET, picaridin, or oil of lemon eucalyptus keeps them at bay, but stores are full of wristbands, candles, clothing, and other products that claim to repel bugs without those nasty "chemicals." Some of them might help, but none are reliable.