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After years of dedicated research, Japan's Shikoku Research Institute discovered that green light with a wavelength between 480 and 560 nanometers—safe for plant growth and photosynthesis—can effectively control diseases like strawberry anthracnose and cucumber gray mold, outperforming traditional pesticides. This groundbreaking finding marks the first time in biological engineering that light has been used as a method to prevent plant diseases.
Through extensive experiments, researchers found that green light enhances the activity of genetic factors responsible for plant resistance. The institute carefully determined the optimal irradiation duration, frequency, and intensity, establishing a clear link between green light exposure and improved disease resistance. Light sources such as LEDs and fluorescent lamps that emit the right spectrum can now be utilized for this innovative technique.
This pesticide-free approach not only boosts the plant’s natural defenses but also supports healthy growth without any negative side effects. The technology holds great promise for sustainable agriculture and could soon be widely adopted.
Collaborative trials conducted by five agricultural research institutes confirmed that strawberry seedlings exposed to green light showed strong, healthy growth, with no signs of disease. These results highlight the potential of light-based disease prevention as a safe and effective alternative to chemical treatments.