Summary of vote counting by treatment method used to control Tamarix, based on whether any change at all was reported in the publication. Each cell represents a combination of the listed treatment method and response variable. Bars represent the numbers of desirable outcomes (shown in blue), undesirable outcomes (red), neutral outcomes (dark grey) and no-change (light grey). Width reflects sample size, with number of observations (number of papers in parentheses) reported in each cell.