Agreed, I don't think that's poison oak. If it was though, this stuff will kill it and everything else in the pictures.
http://www.amazon.com/Bayer-Advanced-704640-Concentrate-32-Ounce/dp/B001DKBDHK
I've used a B&D Leaf Hog for 3 years. It has served me well and I usually collect about 80 bags of leaves per year. The metal impeller can handle acorns and twigs. Mainly I just want to recommend a blower with an oscillator attachment like mine has. It generates a pulsing action that works leaves loose really well. Without it, leaves, grass and shrubs just kinda get matted down and the leaves don't move as much.