The program was developed after three years of research by Hawkes Bay, North Island, grape growers, wine companies and research scientists, and relies on weather forecasts.
Growers say the software, which uses weather data to calculate when conditions will produce disease and harmful pests, enables them to manage their vineyards "intelligently".
It tells them when the crops need spraying, and over the trial period has reduced the amount of insecticide used, minimising damage to the environment.
The software uses daily temperature, rainfall and humidity-level readings to advise growers when spraying is needed. A more advanced program that predicts future weather and disease patterns is also being developed.
Project manager Campbell Agnew said, "The program takes the guesswork out of spraying by pre-empting the outbreak of disease."
The software is being developed and marketed by Hort Plus, based in Hastings, New Zealand.