that has been used in Alberta, Canada to control leafy spurge, an invasive plant that reduces pasture quality and degrades natural habitats.

[1] It, along with A. lacertosa, is one of only two biocontrol agents thought to be effective against leafy spurge.

[2] Larvae cause the most damage to the plant by feeding on the roots.

[2] A. nigriscutis will feed on the native Euphorbia robusta Engelm, though this is thought to be acceptable as the weevil significantly reduces leafy spurge populations over time.

[3] A 14-year study documented a slight increase plant species richness in a Montana grassland system after release of A. nigriscutis to control leafy spurge.