A computer controlled spray system provides optimum precision during pesticide application and provides for environmentally clean handling of rinsate and excess pesticide mixtures remaining in the system following pesticide application. The computer driven controller automatically prepares the system at boot-up for attachment of a bottle of spray mixture. On cue from the operator the system is pressurized and paused to allow the operator to check for leaks. On second operator cue, all spray, rinse, and purge operations are automatically governed by the computer program. Manual override is available at any time. The system provides flexibility for upgrading or addition of other helps such as sensors to record temperature and humidity.