Tapping rubber trees is called "controlled wounding." A tree is tapped for six years and then they let it rest for six years. Rubber trees produce for 30 years. The rubber tree plantation has three products: (1) latex, (2) block rubber from which tires are made, (3) wood from the rubber trees.
Every morning, a 1/16 inch cut is made into the tree to start the latex flowing.
The white line on the tree is latex which immediately started flowing.
You can see the latex dripping into the cup attached to the tree. Workers come around and collect from each of the cups.