How to Attract Trichogramma Wasps

Updated April 07, 2017

These tiny, stingless, black, yellow and red wasps are used worldwide to attack worms and caterpillars that attack corn, avocados, almonds, tomatoes, lettuce, cabbage and other crops. They are also deadly to tent caterpillars. The wasps lay up to 300 eggs each in moth and butterfly eggs. After seven to 10 days, another wasp, instead of a caterpillar, emerges from the egg. They are much more effective than pesticides against species like earworms and tomato fruitworms. But these wasps live very brief lives.

Plant sun hemp, daisies, chamomile, sage, basil, sage, lavender, peppermint and catnip in your yard, garden, orchard or truck patch. Trichogramma Wasps are naturally attracted to these plants.

Put a bird bath in your yard and place small pans of water around your garden. Put rocks in the birdbath and pans so the very small wasps (they are less than 1/32 inch long) can drink without drowning.

Buy a starter colony of trichogramma wasp eggs online or from a nursery when caterpillars start to emerge. The eggs come on small cards with about 3,300 eggs per card. Use about 10,000 eggs, or three cards, per acre. Some sources for trichogramma eggs are listed in the resources below.

Things You'll Need

  • Daisies, lavender, catnip and other plants
  • Bird bath and small pans
  • Water
  • Rocks
  • Trichogramma wasp eggs (optional)
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About the Author

Don Davis has been a professional writer since 1977. He has had numerous writing jobs, including writing news and features for the "Metrowest Daily News" and "Los Angeles Herald-Examiner." Davis has a Bachelor of Arts in English and history from Indiana State University.