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Adults emerge from soil in April and June. Adults are 3-5 mm long and orange with brown stripes along the wings.

Adults emerge from soil in late May and are present through August. They are hairy and brown with white stripes.

Gall wasps are small and black. They do not have stingers.

Adults are found on plants from May through July.

Mature larvae are small, green caterpillars with three dark stripes running the length of the body.

A. malherbae are visible when viewed under a microscope.

Native to Europe, Scotch broom grows on roadsides, pastures, open areas, and recently disturbed areas.

Native to Eurasia. Russian olive is a weed of gardens, roadsides, pastures, waterways, cropland, meadows, and seasonally moist open areas.

Native to Eurasia, myrtle spurge is a weed of gardens, dry natural hillsides, waste areas, and public lands.

Native to Asia and Africa, several cultivars of cogongrass are grown as ornamentals.