Lyme disease has been on a steady increase for over a decade. The bacteria responsible for transmitting the disease immunosuppresses the infected tick, causing it to become a potential carrier of other diseases, and a similar rise in tick-vectored illnesses have been reported by the CDC for Rocky Mountain Spotted Fever, Ehrlichiosis, and Babesiosis.
The most common way to remove ticks from homes is to spray with the insecticide Permethrin. While this is extremely effective, it can also be dangerous. Permethrin is known to be toxic to fish, certain birds, cats, and some other animals. It is illegal in most states to spray it near streams for fear of runoff contaminating the water. A recent study funded by the US Army Medical Research Command shows permethrin is likely implicated in causing Gulf War Syndrome.
Ticks are not distributed evenly over their habitat; instead they tend to disproportionately crowd a relatively narrow
band at the junction of forest and lawn. This area, called the ecotone, is just roughly 10 feet wide and is the
site of most human/tick interactions.
A "Robot-tic" Solution
We developed a method to reduce tick population using robotics. We placed a hollow tube through the ecotone surrounding the property to be protected that emits CO2 through small holes drilled in its wall. Since the ticks are naturally attracted to CO2, the ticks consolidate from the ecotone to within a few inches of the tube. The tube also houses a wire that emits a low-frequency magnetic field. We constructed a robot that is able to track that magnetic field and slowly travels around the tubing, dragging a denim skirt infused with permethrin. The ticks sense the vibration and slightly-elevated, friction-induced temperature of the skirt and attach to it. Although they recognize the skirt has no blood and detach within a few minutes, they will have already absorbed a toxic level of permethrin and will die within a few hours. Virtually no permethrin is left in the environment, except for trace amounts leeched from from the skirt and in the dead tick bodies. The top photo shows some of an eclectic group of people who built the third generation robo-tic, including from left to right, John Ruhl (VMI '13), Andy VanOsten, Stuart Hughes (VMI '13), Jeremy Swiney (VMI '14), Dr. Daniel Sonenshine (ODU), Nathan Howard (VMI'13), Dr. Holly Graaf (ODU), Dr. Jim Squire (VMI), Dr. Jay Sullivan (VMI), and Dr. Dave Livingstone (VMI).
We currently are on the third, and last, generation of the Tick
Rover. The third generation is a huge improvement;
mechanically it is far more robust, can generate three times the
torque, and is designed using CNC equipment so it can be mass
produced. Electronically it has improved navigation and speed
control algorithms, and is simpler to operate since its onboard
computer performs calibration functions that previously had to be
set manually. A closeup of its penumatic/hydraulic front end
is shown below.
MediaMedia from 2013 experiments are embedded in the media section of the research folder here. Older media clips are below:
The first generation Robo-tic was shown on the Discovery Channel on their Planet Earth segment in Canada and Europe. It features Dennis Crump, but Barry Hammond, Justin Woulfe, and professors Dave Livingston, Jay Sullivan, and Jim Squire were also involved. It first aired on June 16, 2006.
WSLS News 10 from Roanoke did a segment on the Tick Rover also. Jay Warren interviewed primarily Barry Hammond, but Dennis Crump, Justin Woulfe, and professors Dave Livingston, Jay Sullivan, and Jim Squire were also involved. It first aired on April 12, 2006.
Lab test of the Generation III robot showing it's considerable torque and four-wheel steering. The slight pause you see when it encounters an obstacle is not because it is torque-limited, but rather because it is computing the correct amount of torque to apply to maintain a constant speed. It updates these calculations roughly one hundred times per second.
Here the third generation robot is being demonstrated to the biology researchers at Old Dominion University on May 1, 2013. It is highly water-resistent; rain gave it no trouble.