Insect identification is a key skill for gardeners; learning the good guys from the bad guys helps your garden grow better. These picnic pests provide some benefits to the garden.

Guest blog post by Bill Johnson, an award-winning nature photographer with a background in entomology and he writes Horticulture magazine’s Insect ID column. Here are tips on how to fine-tune your insect identification skills.

Yellow jackets, or ground wasps, can be a real nuisance at the end-of-summer family picnic, but they get a bit of a bad rap. They are natural predators of caterpillars, grubs, grasshoppers and flies, all of which they feed to their larvae. Adults find their own sustenance in nectar, and while they are at it they pollinate flowers (though not to the extent that bees do, since they do not have pollen sacks). They take honeydew from aphid colonies; the presence of yellow jackets around trees and plants in late summer may tip you off to an aphid infestation.

Some people mistakenly refer to yellow jackets as bees, but they’re ground-nesting wasps. Unlike a lot of ground-nesting solitary bees, these wasps form colonies underground that can sometimes contain several thousand individuals. The workers and the males do not survive winter, but a new queen does. She emerges in spring to start a new underground home.


When I was in high school, I wanted to see just how big a yellow jacket nest was. Late one fall, after the killing frosts had come, I decided to dig one up. To my surprise, it was a little bigger than a football and comparable to large bald-faced hornet nests that are seen hanging in trees. It contained layers of combs and quite a few dead wasps. I brought all of this into my folks’ basement and proceeded to pick through the debris. Suddenly I heard buzzing. I quickly realized that they were not dead yet—a few hundred yellow jackets were beginning to come to life in the warm basement. Well, they went back outside very quickly. The moral of this story: don’t do that at home. You also don’t want to disturb a colony by running over the nest entrance with a lawn mower. I’ve done that, too, and they become a bit testy.

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