Levels of replication for each of the treatment sequences used to control Bitou Bush at BNP.

The code for survey shows the year and the identity of the sample period in that year; for example, the second vegetation survey completed in 2007 is denoted 07b. The codes for disturbance sequence are S for spray, and F for fire. Where there were fewer than three such sub-treatments in the four years prior to a survey, we use the letter X to show the missing treatment. Thus, the sequence spray-fire-spray was denoted as SFS, but where only a single spray event was conducted the code is XXS, and in the absence of any control measures (and prior to the application of treatments), the code is XXX. For the control sites, which were not part of the Bitou Bush infested area, we added ‘c’ to the sequence code. Since half these sites were not treated and half received one spray, the only sequences observed were XXXc and XXSc.Levels of replication for each of the treatment sequences used to control Bitou Bush at BNP.