In the pic, the plant on the right is salal, a harmless plant, the center one may be poison oak, I don't know the one on the left.
Guess I wasn't real clear on my intent. I plan to drill into the vine using a 12" long drill bit near the base like the OP, then place the Glyphosate filled pipettes in the hole rather than feeding the herbicide with a syringe (unlike the OP). When empty, I'll replace the old empty pipette with a new filled one while discarding the old one in a plastic bag to contain any oils it may have on it.Putting it into the soil is a waste of time, herbicide and money.
...Whatever does not get washed away and does appear this product will knock it out and significantly reduce the itching and swelling associated with poison ivy. Product Information - Zanfel Poison Ivy Wash for treating rashes from poison ivy, poison oak, and poison sumac - Zanfel Laboratories
If you shop around on eBay you can find the Zanfel for $10 or $12. It retails in stores for $30-$40 it does pay to shop around. Cortex wipes again on the Internet is about $.50 a packet.