Collector app mapping to assess effectiveness of invasive grass control.
The Collector app has been used for several years in the Australian Capital Territory (ACT) for mapping infestations of naturalised plants and invasive plants and their control. The app is used on both Smartphones and tablets. There is now sufficient data to reveal trends in distribution and density of targeted species after control work. African lovegrass, serrated tussock and Chilean needle grass are the most commonly controlled invasive grasses in the ACT. All three of these invasive species have massive impacts on native plant diversity, so understanding the resources required for control work is important. The data shows that with stable resourcing over a number of years, land managers can gain control of invasive grass infestations. Direct control involves using herbicides such as glyphosate and/or flupropanate, but other management tools also play an important part in successful control. The analysis also revealed how to improve both the accuracy of polygons and visual estimates of density.