Hortibot to Zap Weeds

Work at Aarhus University in Denmark hopes to produce a bolt-on accessory

package for mowing robots to provide both simple weeding tools and
possibly
even lasers for zapping undesirable plant growth. The system can also be
used to dispense chemicals in a very focused way in order to reduce
environmental impact. Hortibot is not completely autonomous but still
claims an
improvement in work efficiency. The project
list includes squeezing Hortibot's Linux-based controller into the
size of a credit card, and allowing a mobile phone to retrieve system
status - iMow anyone?

Source: http://www.netchain.com