Xanthium
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Euaresta aequalis
burr-seed fly
Euaresta aequalis is a North American fruit fly in the family Tephritidae, commonly known as the burr-seed fly. It is a specialist herbivore whose only known host is the common cocklebur (Xanthium strumarium). Females possess large ovipositors adapted for penetrating the hard, spiny burr capsules to deposit eggs. The species was introduced to Australia in the 1930s as a biological control agent for invasive cocklebur but established only at low levels and proved ineffective. It is univoltine, with adults active from mid-July to mid-August.