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Minute pirate bug

By: Garden Gate staff
It may be tiny, but this 1/4-in.-long bug has a big appetite — for other bugs, that is.

from the wild side

Minute pirate bug Orius tristicolor spp.

IDENTIFICATION — It may be tiny, but this 1/4-in.-long bug has a big appetite — for other bugs, that is. The minute pirate bug is most common in the western United States and Canada. It has an oval-shaped body with black and white wings like the one in the illustration.

Both the adult and nymph form of the minute pirate bug will eat just about any small insect. Thrips, mites and aphids are some of its favorites. That makes this feisty little bug a big asset in the garden. When prey is scarce, the minute pirate bug feeds on pollen and plant sap.

If you pick up a minute pirate bug, watch out! It will bite. Reactions range from nothing other than the initial discomfort to a small bump similar to a mosquito bite, without the itch. Think you’ve seen this bug in the Midwest? It’s probably the insidious flower bug (O. insidiosus), a close cousin.

LIFE CYCLE — In spring, minute pirate bugs lay eggs in plant stems or leaf tissues. Eggs hatch in three to five days, and the nymphs immediately start looking for small insects on which to feed. It takes about 20 days and five stages for a minute pirate bug to reach adulthood. Then after about a month it dies. Several generations of this bug can occur over the course of a growing season.

You probably already have minute pirate bugs or insidious flower bugs in your garden. But to keep them around and perhaps attract a few more, avoid spraying insecticides. Also, grow flat-topped flowers like daisies and yarrow, whose pollen is easy to get at. That way, these little garden helpers will have something to keep them going once they’ve whittled down the pest population in your garden.

Published: April 20, 2010
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