Balancing the Bugs

By Toni Leland
Published on April 30, 2008
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An orange assassin bug waits for prey.
An orange assassin bug waits for prey.
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A forked-tailed bush katydid rests on a dahlia blossom.
A forked-tailed bush katydid rests on a dahlia blossom.
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Praying mantis nymphs emerge attached to a silk line.
Praying mantis nymphs emerge attached to a silk line.
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A praying mantis freezes while awaiting its prey.
A praying mantis freezes while awaiting its prey.
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A Western Pondhawk dragonfly rests.
A Western Pondhawk dragonfly rests.
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An ant tending its herd of honeydew-producing aphids.
An ant tending its herd of honeydew-producing aphids.
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A squash bug prepares to feed.
A squash bug prepares to feed.
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It's chow time for this Japanese beetle.
It's chow time for this Japanese beetle.
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A red currant bush hosts a pack of stink bug nymphs.
A red currant bush hosts a pack of stink bug nymphs.
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Larvae of a parasitic wasp are attached to a food source.
Larvae of a parasitic wasp are attached to a food source.

Did you know that close to a thousand species of insects live in your yard? Good ones and bad, functioning together in a carefully balanced ecosystem. As responsible keepers of our planet, we continually need to make decisions about how to live with both. What follows is not intended as instruction for controlling those invertebrates, but rather a guide to using nature’s ways to maintain the balance.

Whether you call them “insects” or “bugs” (which in some taxonomies are actually a subgroup of insects), of the nearly 100,000 known species, only 600 are considered to be pests. Do you know which are which?

Finding the good guys

Most beneficial insects are pollinators, predators or parasites. Pollinating insects move pollen between bisexual plants, or within unisexual plants, thereby guaranteeing reproduction. Bees and butterflies are pollinators. Predatory insects eat other insects; spiders immediately come to mind, but they aren’t insects, they’re arachnids. The assassin bug (Reduviidae sp.) is a good example of a predatory insect; fly-eating wasps fall into this category, too. Parasitic insects are really parasitoids because they invariably kill their host. So-called parasitic wasps are included in this category because their larval form lives in, and ultimately consumes, its host. Keeping your landscape healthy requires the presence of these good guys to keep things in balance. If you use insecticides to eradicate the pests, you run the risk of killing the beneficial insects directly, and you destroy the food source for some of them as well.

Beneficials of note

One of the most voracious predatory insects is the convergent ladybird beetle (Hippodamia convergens), commonly called a “ladybug.” This species consumes huge quantities of aphids, scale insects and mites and is sold commercially for agricultural pest control. Identifying features include two to 13 black spots on red wing covers and a distinctive black and white pattern behind the head. This diminutive insect is not to be confused with the invasive multicolored Asian ladybeetle (Harmonia axyridis), an annoying pest that invades our homes in the fall, littering windowsills and clogging vacuum cleaners. Asian ladybeetles range in color from yellow to orange to red, with up to 19 spots or none – their thorax (body segment behind the head) is also partially white or cream colored. Despite their bad rap-sheet, Asian ladybeetles consume copious quantities of scale insects and aphids, and are responsible for benefiting the pecan industry significantly by eliminating the pecan aphid as well as other insect pests in fruit orchards, tree farms and agricultural crops.

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