Published November 1977. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Most insects are not pests. Only those that
feed on desirable plants or transmit disease
cause problems for gardeners. Many insects
are very useful. Some are pollinators of fruits, flowers,
and vegetables, while others help control insect
There are three types of beneficial insects: predators,
pollinators, and parasitoids.
The cards in this guide are designed to help
you quickly learn the main groups of natural
enemies of crop and garden pests, their
predacious activity, and tips for observing them.
Photographs are of the most common species in
the Pacific Northwest.