Cooperative Extension in Salinas Responds to Reports of “Red” Aphids in Organic Romaine

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A recent blog post by Alejandro Del Pozo-Valdivia, UC Cooperative Extension entomologist based in Salinas, addresses reports he’s received about “red aphids” being found in organic romaine lettuce varieties that are resistant to the lettuce aphid.
Laboratory analysis showed that the “red aphids” were not lettuce aphids, but were actually either potato aphids or foxglove aphids. 
Del Pozo-Valdivia’s blog shows pictures of different species of aphids and makes the point that body color is not the best trait to use to identify aphid species because they can change color during their lifespan.
The blog includes additional information on identifying aphid species commonly found in lettuce.