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Biological Control
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Whitefly's, spidermites, leaf miners and other unwanted guests have come to munch on your greenhouse plants. Biological controls can be one way to control these intruders. Here are some sites that can help you identify the correct method of control for your insect problems.

Biological Control - Questions and Answers for the Home Gardener	The basic information you need to get started with biological control
Biological Control Virtual Information Center	In-depth information on bio-control. Including some helpful tables about greenhouse pests and their corresponding predators
Biological Control: A Guide to Natural Enemies in North America	A guide to many different kinds of biological control agents.
Suppliers of Beneficial Organisms in North America	A very comprehensive list of suppliers of beneficials. Published by the California EPA. Adobe Acrobat is needed to download the list.
Koppert Biological Systems	A commercial vendor of Biological Control. this site has a lot of quality technical information regarding biologicals.