Is This Growth On Tree In Texas Poisonous

Question From: C. Harris - Forney, Texas, United States
Q: Is this poisonous it grew on my tree this year. I've got hives on arms and itch.
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A: I live in Michigan and am not familiar with the plants that grow in Texas. Google the Horticulture department at Texas A and M for an accurate id. They don't call them Aggies for nothing. Best And Happy Yardening, Nancy