From the latest UC Davis CEH Horse Report: Oleander Poisoning: The Preventable Illness -
"Oleander is one of the most poisonous plants and contains numerous toxic compounds, many of which can be deadly to people and animals. It is especially dangerous to horses, as it is sweet. Symptoms of a poisoned horse include severe diarrhea, colic and abnormal heartbeat." (Read the entire article)
Any plants that are removed should be bagged and taken off the property as soon as possible as the dried leaves are as toxic as the live plant. Toxicity can also occur from inhaling smoke from burning oleander leaves and wood.
One of the most complete listings of poisonous plants is the Cornell University Poisonous Plants Informational Database which lists plants by both common name and scientific name.
Another excellent resource is A Guide to Plant Poisoning of Animals in North America from IVIS (International Veterinary Information Service), which lists plants by systems affected - very helpful if your horse is showing symptoms and you and your vet are trying to determine a possible cause. Accessing IVIS does require registration (which is free).
If you’re uncertain of your skill at identifying plants you can consult with your state’s local Cooperative Extension agent to walk your land with you to identify potential problem plants.
Patti in Vail AZ
- where I hope to see everyone keep their horses safe.
UC Davis CEH Horse Report http://www.vetmed.ucdavis.edu/ceh/current.cfm
Cornell University Department of Animal Science:
Plants Poisonous to Livestock and other Animals Database
International Veterinary Information System (IVIS)
A Guide to Plant Poisoning of Animals in North America
Cooperative Extension System
Each U.S. state and territory has a state office at its land-grant university and a network of local or regional offices. These offices are staffed by one or more experts who provide useful, practical, and research-based information to agricultural producers, small business owners, youth, consumers, and others in rural areas and communities of all sizes.