Answer: If the saplings are from sprouting seeds, you can use a vegetation killer to get rid of them; if they are sprouting from the roots of the oak tree, you'll need to pull or cut them off at ground level. If you use an herbicide, it will be translocated throughout the tree and could cause death. I think I'd opt for using a weed whacker to get rid of them!
There's a landscape firm in California that successfully uses a combination of techniques (cutting, burning, spot-herbicide applications and grazing goats!) to vanquish poison ivy. If there isn't someone in your area that can provide this service, probably the only way you are going to get rid of the poison ivy is to use a systemic herbicide (such as "Weed-Be-Gone"). Call your Solid Waste District to find a safe place to discard the dead plant material. You'll need to stay on patrol to keep any stray escapees from returning to the site (it may be worth your while to invest in a flame weeder for this purpose). Once you've conquered the poison ivy then put down a thick layer of compost
Q&A Library Searching Tips