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Aphids? - Melanaphis donacis

Aphids? - Melanaphis donacis
Vista, San Diego County, California, USA
June 25, 2019
Size: 2-3mm

Moved from Aphids.

Moved for expert attention
Moved from ID Request.

Do you know what plant they were on?

Giant reed (Arundo donax), so
Giant reed (Arundo donax), so I think they might be Melanaphis donacis?

I think you are correct!
Looking at the other species that host on this plant (According to Aphids on the World's Plants) that's the best match, I don't know anything else that gets this waxy appearance.

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