By Daisy_11
California,
United States 
Are these brown aphids??? (on Achillea / Yarrow stems)
1 Jun, 2011
Featured on:
pests
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« Updated Q with Photos : Euphorbia leaves turned yellow. Watered thoroughly...
Yep, those are aphids. All the usual aphid remedies should work: soap, pyrethroids, systemics, etc.
1 Jun, 2011