Three species of Amaranthus and Chenopodium album
as host plants for Staphylus hayhurstii
Click any red highlighted picture for a larger view

flower heads


Amaranthus tuberculatus - Tall Water Hemp

mid-instar larvae
Amaranthus retroflexus - Redroot Pigweed

Amaranthus hybridus - Smooth Pigweed

mature larva

early instar larva
Chenopodium album - Lamb's Quarters
I also looked at a few plants of Amaranthus spinosus (Spiny Amaranth), but didn't find any larvae....yet.