... of carbohydrates from the leaves to the roots. If only the phloem layer is severed, it will ... ring, placed below the lowest branches on that individual. If the girdling cut, or “kerf”, cannot be placed ... with a chainsaw, axe, or specialized girdling tool. If girdling with a chainsaw, for each kerf saw two ... the grooves with a chisel or other implement. If girdling with an axe, chop two parallel grooves ...