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Be on the Lookout for Garlic Mustard Aphids!

Garlic Mustard is an invasive species that produces chemicals that inhibit the growth of other plants and mycorrhizal fungi needed for healthy tree growth and tree seedling survival. Garlic Mustard is typically managed through mechanical or chemical means. However, new discoveries have reported Garlic Mustard being negatively impacted by a Garlic Mustard aphid (Liaphis alliriae). Due to the impact, the aphids seem to have on the plant, we believe they could help control invasive Garlic Mustard plants, but we need you to help map their distribution!

Where do you find Garlic Mustard? Garlic Mustard is most common on forest edges and in shaded woodland areas, but it is also known to grow in open fields. You will often find it on shady roadsides, fences, hedgerows, and along walking paths in the woods.

How do you spot Garlic Mustard? Look for heart-shaped basal rosettes (leaves) appearing in year one at ground level. In the second year, stems shoot up (1-4 feet) and develop flowers and seeds. Leaves become more toothed and triangular in shape.


If you see Garlic Mustard, look for aphids on the plants, or damage to the leaves, report your findings (include an image) to EDDMaps- or download the EDDMaps app! Negative sightings are also strongly encouraged - where Garlic Mustard is present but the aphid is not.

Any Questions? Contact Rebecca Troutman ( or Wild Rivers Invasive Species Coalition (WRISC) at

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