After working in the hydroponic and aquaponic industry for 3 years, I can say that automation for removal of bad plants is the last key needed to create fully autonomous farms. The margins in farming aren't that high and the labor for harvesting(already solved by robotics) and separating the good from the bad plants are the most time consuming and costly tasks. Having that automated would allow you to have just one or two technicians on hand in a farm rather than a handful of technicians, a lot of laborers, and a manager.

Edit: by technicians I mean farm technicians, the people that have a background in plant ecology or are botanists