Well,
My cat is allergic to:
bluegrass
orchardgrass
timothy
brome
ragweed
pigweed
marsh elder
cottonwood
aspen
box elder
maple
cladosporium-fungi
penicillium-fungi
candida albicans-yeast
pullularia-fungi
venison
corn -this is a biggie since most cat food is made from it
white potato
brewers yeast
alfalfa
staph
He is sensitive to:
vernal grass
sycamore
saccharomyces-fungi
flax seed
tobacco smoke
He has lots of symptoms ranging from sneezing to scratching himself til he bleeds. I have him on special food that cost $30.00 for an 8lb bag, but I cannot prevent grass clippings or hay pieces from coming in the house on our clothes or shoes.
He is doing better now though that his diet has changed, the only symptoms I see is ocassional scratching when we mow the lawn.