Fig. (2) Effects of bark treatment with SWCE on tapping cut dryness, latex yield, and plugging index 2 months after application. SWCE was applied once (single) or twice (double) at a 1-month interval on the lightly scraped bark of (a) partial-TPD- and (b) total-TPD-affected rubber trees. Bars are means ± SEM of 10 replicate trees; bars without a letter in common are significantly different (p < 0.05) according to the Waller–Duncan K-ratio t-test.