How can I kill poison ivy and...

The only successful method of eradication is the use of chemicals. Even those who are environmentally conscious usually resort to them. Pulling the plants doesn’t stop the broken-off rootlets from forming again the next year, and some of the worst cases of poison ivy and oak dermatitis come from “grubbing out” the plants and roots. It is also unsafe to burn poison ivy and oak. The tiny urushiol (the oil that causes blistering in humans) molecules are carried in smoke and can be deposited on clothing and skin, in eyes and ears, and even on food. They also can be inhaled, causing a reaction in the lungs. So stick with the chemicals. You can find several commercial products at farm and garden stores.