They probably came in from other plants before or after you purchased them. The best predator to release is Phytoseilus persimilus. I have had good results purchasing them from IPM Labs, Inc. in Locke New York. The information given herein is supplied with the understanding that no discrimination is intended and no endorsement by the Purdue University Cooperative Extension Service is implied. Any person using products listed assumes full responsibility for their use in accordance with current direction of the manufacturer.
Information listed is valid only for the state of Indiana.
If you didn't see your plant or pest problem mentioned, send your question or comment to our panel of experts at the Plant and Pest Diagnostic Laboratory at Purdue University. We'll try and post as many questions and answers here as we can.