What can we say, we love drones for purposes like this, and as such, we would like to share some interesting applications and research that is landscape orientated from the CSIRO.
Please also go here which is where we saw the full article:
http://www.news.com.au/technology/environment/drone-helicopters-versus-purple-plague-csiro-takes-on-invasive-biosecurity-threat/story-e6frflp0-1227038578344