All treatments were highly effective in controlling ailanthus, ranging from 91-96% in crown mortality for basal bark treatments to 100% control of resprouting for cut stump treatments 12-19 months after application (Table 1). The frequency distribution of the different response classes was significantly skewed towards complete control of ailanthus (%2 = 12.4, p = 0.006). The average percentage of trees per group in the complete control class did not differ between cut-stump and basal bark treatments (%2 = 0.1, p = 0.75). For basal bark treatments, complete control did not differ between spring or fall applications (%2 = 0.07, p = 0.8).

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