Dacnusa - leaf miner control for cooler conditions

Description

Dacnusa sibirica are parasitoids of leaf miner larvae. Adults are small, dark, non-stinging wasps 2-3mm with long antennae. Females lay their eggs in leaf miner larvae (preferably the 1st & 2nd development stages) which serves as a host for their offspring. Dacnusa can discern between non-parasitized and parasitized larvae, increasing their effectiveness. 

This beneficial insect offers good control in cooler conditions, making them suitable for Spring and Fall releases and also at low prey densities. Use Dacnusa when temperatures are below 68F and support with Diglyphus when temperatures are above 68F. Target crops are vegetables, ornamentals, cut flowers and cannabis.

Target Pests

Leaf miners, especially in the genus Liriomyza. This species is native to Europe.

Life Cycle

Adults live for about 2 weeks. During this period, a female can lay up to 90 eggs in the larvae of leaf miners, which hatch within 4 days of laying. Dacnusa larvae mature inside the leaf miner larvae, the total development time from egg to adult is about 2 weeks at 72°F.

Instructions for Use

• Release early in the morning or late in the afternoon.
• Hold the bottle horizontally and carefully remove the lid while standing near the crop.
• Release the biocontrol agents by gently tapping the opened bottle while walking through the target area.
• Leave the open bottle upright in the infested area for a few hours to allow any remaining parasites to escape.
• If needed, hold in darkness at 55-60°F in moderately humid environment for no more than 18 hours.

Application Rates

Introduce 3-5/sq. ft. weekly until control is achieved. Release rates will vary depending on conditions. 

Further Resources

Leafminer Pests of Greenhouse Crops – UConn Extension

Dacnusa and Diglyphus effective combination against leafminer - HortiDaily