Fig. (4) Effects of bark treatment with SWCE on tapping cut dryness and latex volume of trees with a history of ethephon stimulation. SWCE was applied at months 0, 2, and 4 on the lightly scraped bark of (a) partial-TPD- and (b) total-TPD-affected rubber trees. Treated trees were not tapped during the experiment. Bars are means ± SEM of 15 replicate trees; data points with asterisks denote significant differences (p < 0.05), and “ns” indicates no significant difference (p ≥ 0.05) between control and SWCE-treated trees according to a 2-sample t-test for unequal variance.