Eretmocerus eremicus – Whitefly Parasitic Wasps on Cards (5000 / 10000 / 15000)

Eretmocerus eremicus is a small beneficial wasp widely used to suppress whitefly populations in vegetable, ornamental, and greenhouse crops. It is an effective alternative to chemical sprays, helping growers maintain healthy plants through natural biological control.

How it Works

Female wasps search for whitefly nymphs and deposit their eggs beneath them. When the eggs hatch, the young larvae penetrate the host and feed internally, ultimately killing the whitefly. In addition to parasitization, adult wasps can also consume whitefly nymphs directly, adding another layer of control. Over time, new adult wasps emerge and continue spreading through the crop to locate new hosts.

Targets These Species

• Greenhouse whitefly (Trialeurodes vaporariorum)

• Sweet potato whitefly (Bemisia tabaci)

• Other related whitefly species commonly found in greenhouse and field environments

Ideal Conditions

• Temperature range: 68–85°F (20–29°C)

• Moderate to high humidity promotes success

• Performs well in protected environments such as greenhouses and covered production

Application Instructions

Introduce wasps as soon as whiteflies are detected, or preventatively in crops known to be highly susceptible. Distribute evenly across the growing area, focusing higher numbers on infested zones. Releases should be repeated as needed, especially in crops with persistent whitefly pressure. Eretmocerus eremicus can be combined with other beneficial insects, such as Encarsia formosa, for stronger control.

Release Rates

• Light pressure: 0.5–2 per 10 square feet, applied every two weeks

• Moderate pressure: 5–20 per 10 square feet, applied weekly to biweekly

• Crops highly attractive to whiteflies may require weekly preventative applications rather than every two weeks

Where to Use

• Greenhouses and indoor growing areas

• Nurseries and ornamental production

• Vegetable crops

• Hydroponic systems and indoor gardens

Shipping and Storage

Eretmocerus eremicus are shipped in a parasitized state, ready to emerge as adults once introduced. Release them as soon as possible after arrival for best performance. If necessary, short-term storage is possible at 50–59°F (10–15°C) in a dark location for up to 24 hours.

Quick Tips

• Start releases early before whitefly populations become established.

• Avoid chemical pesticide use before or after release, as residues can harm beneficial insects.

• Combine with sticky cards to monitor both pest and beneficial activity.

• Works best in warm, enclosed growing environments.