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I can tell you a definitive YES they will kill your horses if the leaves are ingested in quantity and/or as fallen leaves during fall or when trees are cut. I have had the terrible painful tragedy in fall of 2013 which suddenly killed 5 of my mares. The vets, the vet school, and the State Animal Health and Food Safety lab were on the case and it took over a week to get the indisputable proof, but YES IT ACTS JUST LIKE RED MAPLE POISONING. There will be a veterinary paper published on this, sadly with my sweet horses providing the data.

Answer2:

Although I could not find any real definitive yes or no answer to the question I would have to say it is best to keep horses away from Pistachio trees. The horses could ingest the bark, shells from the nuts, or leaves and possibly choke or colic or even have an allergic reaction.

If you are ever unsure about a plant being toxic to horses you should contact a local equine veterinarian and your local county extension agency to inquire about the plant in question.

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