Insert a half-inch diameter plastic tube into the hole until it stays in place. Don't push it too far or you'll clog it with wood tissue. Let the tube extend an inch or so beyond the trunk so that the dripping flux will fall to the ground and not run down the tree. And be sure to disinfect your tools with rubbing alcohol after each use. We have a plant in our backyard that bears lovely fruit.
Wild plants are sometimes so colorful and enticing.
Some even look good enough to eat. I get many calls on whether or not a plant or plant part is edible. It's a very tough question to answer sometimes, and risky too. Never eat any plant that you cannot positively identify. Some plants are generally known to be highly toxic, including poison hemlock, death camas, and larkspur.