I know of many plants that are toxic to horses, but I've only heard of an allergy to the dust in hay, which causes heaves.
Among food types budgies are HIGHLY allergic to avocados and chocolate. Among plants they are allergic to a collection of things such as mistletoe and Calil lilies. There is a list on the related link belo.
Try Google. They are pretty reliable.
Nowhere, not all plants have been tested for toxicity.
you can find it in the wiki.answers.com/ Flora of Philipines
list of gene families in plants
The allergic reactions to west Nile and 5 way vaccines in horse can range in the severity. The most common reaction is lethargy, muscle swelling at the injection site, and fever. More severe reactions include hives, bleeding from capillaries causing edema, and anaphylaxis.
the field
Yes azalea like most ornamental type plants are toxic to horses and should be removed from any place that they could come in contact with them. You can also contact your local agricultural extension agency for a list of toxic plant in your area.
Vaccine labels carry a list of adverse events that may be seen.
There are lots of poisonous plants and trees that are poisonous to horses, here is a list of most of them to look out for! For information on the following check them out on google.Autumn Crocus or Meadow SaffronAlder Buck thornBrackenBittersweet Woody NightshadeBlack BryonyButtercupsBox PrivetFoxgloveIvyCherry LaurelOak treesPotatoPoppyRAGWORTRhododendronYew treesYou could also check out "ALL ABOUT POISONOUS PLANTS" by Sonia Davidson
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You can try a list search and lease the list of these companies with contact information from a variety of list brokers. I will list the most popular list provider in the related links below.