Ladybugs and ladybug larvae feed on aphids. The larvae look nothing like the glossy winged adults. I’ve always thought they have a prehistoric look with their spiky bodies. I found this little guy (or girl?) crawling around on my kumquat tree, which as far as I can tell is quite free of aphids. I moved him over to my infested tarragon plant where he immediately began feasting. You can see the carnage pretty well in full screen mode. After a couple weeks of eating he will attach his backside to a leaf and begin the transformation into an adult ladybug.
This biological pest control has worked well for me in the past. Luckily, there is a bush near my office that is usually filled with ladybug larvae at this time of year and I’ve transferred many in a jar to my plants that have fallen under aphid attack. Ladybugs are often for sale at garden centers and even through mail order sites, but I’ve read many accounts from people who’ve attempted to introduce the adults to their gardens and then watched them all fly away. When it comes to this kind of interference with nature for the sake of growing my own food, I feel better about transferring them locally (I collect them within a couple miles of my home) than I do about the idea of bringing in a bunch of bugs from far away—except for the red wigglers of course which are contained and cannot survive without a supplied food source.