Allium Leaf Miner (Phytomyza gymnostoma)
Leafmining pest of leeks, onions and other alliums causing distorted foliage and rotting stems.
Allium leaf miner (Phytomyza gymnostoma) has become a serious pest of leeks, onions and garlic in the UK. Adult flies lay eggs in characteristic rows of punctures; larvae tunnel in the leaves and stems, leading to distortion, rot and secondary infections. Cultural control (fleece, timing of planting, removal of infested material) is critical. Biological control focuses on soil-applied entomopathogenic nematodes targeting pupae and larvae in the base and surrounding soil.
Biological Controls for Allium Leaf Miner (Phytomyza gymnostoma)
The options below are examples of beneficial insects and biological products commonly used against allium leaf miner (phytomyza gymnostoma). Always refer to supplier guidance and product labels for crop safety and local registration status.
Diglyphus isaea
Product: Digline
Environment: outdoor
Temperature Range: 10.0 – 25.0°C
Rate: 0.25–1 wasp/m² in protected or covered crops
Frequency: Weekly during main mining period
Can contribute where alliums are grown under protection or covers; combine with netting and crop hygiene.
Related Biological Solutions
Growers dealing with allium leaf miner (phytomyza gymnostoma) often also monitor these pests as part of a complete IPM programme: