Thynnidae: Flower Wasps
categories: Pollinators Thynnidae Wasps
last review date: 2026-04-26 08:50
Photo by: D.G. James
Biology
Flower wasps are a large family of solitary wasps whose larvae parasitize underground dwelling beetle larvae like scarabs. Most species are small and inconspicuous, but some may be up to an inch in length.
These wasps are frequently found on flowers feeding on nectar and despite their smooth-bodied appearance are able to transport pollen. The natural history of flower wasps is not well known, although some Australian species are known to play an important role as pollinators of terrestrial orchids.
These orchids deceive flower wasps into pseudo-mating with them. These sexually deceptive orchids engage in chemical and physical mimicry of a female wasp with pollination achieved as the male attempts pre-mating or copulatory behavior with the flower.
Attracting and Keeping Natural Enemies
and Pollinators in Your Yard and Garden
- Native plants provide essential resources.
- Native flora also provides natural overwintering sites.
- Natural dispersion from nearby habitats ensures visitation.
- Some kinds of beneficial insects predatory mites are commercially available.
- Avoid regular use of synthetic, broad-spectrum pesticides.
- Infrequent use of certain narrow-spectrum pesticides is more compatible with some beneficials.
- Extensive lawns are also not conducive to attracting beneficial insects.
Management Options
See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.
Chemical Management
IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides.
- None recommended
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.