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Iowa
Illinois
Indiana
Kansas
Kentucky
Minnesota
Michigan
Missouri
North and South Dakota
Nebraska
Ohio
Wisconsin
Bermuda – Cynodon dactylon
Timothy – Phleum pratense
Sorrel, Sheep – Rumex acetosella
Wingscale – Atriplex canescens
Wormwood – Artemisia absinthium
Housedust mite – D. farinae
Housedust mite – D. pteronyssinus
Ash – Fraxinus spp.
Box Elder – Acer negundo
Elm – Ulmus spp.
Hickory – Carya spp.
Maple – Acer spp.
Mulberry – Morus spp.
Oak – Quercus spp.
Privet – Ligustrum vulgare
Willow – Salix spp.
Alternaria alternata
Cladosporium herbatum