*2.2. Measuring the Wound Size and Collecting Increment Cores*

The maximum height and width of a wound measured was reported as the size of the wound made in red pines (*Pinus densiflora*) for resin collection (Figure 2A). To establish the ring-width time series for a wounded surface, an increment core was extracted from the outermost surface of a wound (core A in Figure 2B). Likewise, to establish a reference time series to date the ring-width time series of core A, an increment core was also extracted from the opposite side, which contained tree rings continually from the current year to the year when growth started (core B in Figure 2B).

**Figure 2.** (**A**) Measuring the size of the wound for resin collection and (**B**) extraction of the increment core from a wounded surface (core A) and a sound surface (core B).
