The rubber tree expands with secondary growth, new phloem forms on one side of the cambium tissue, and new xylem on the other. This secondary xylem is known as rubber wood. Phloem is the path of carbohydrates from leaves to root end through the inner part like Artery in the human body. Between the cork cambium and phloem latex vessels are available with a flow from root to leaves like Vain in the human body. The deficiency of carbohydrates will dry the phloem at tapping period and cork cambium will more thicker in first stage without latex vessels.
Will be corrected and completed as soon as possible.