Poison ivy might be a small plant, but it can cause big trouble—for both your yard and your skin. Its oily sap, called urushiol, is what triggers that itchy rash, and even a tiny amount can cause a ...

Q: I have some poison ivy in my backyard, and I am very allergic, so I’d rather not touch it. Are there herbicides that will kill it, and when is the best time to apply them? Write to the Missouri ...