09/01/2026
Cool research. https://www.facebook.com/share/1FxRz1AcSr/?mibextid=wwXIfr
Researchers at the University of Tokyo have found that the color of a crop net matters more than most farmers realized, and the discovery could meaningfully reduce pesticide use on vegetable farms across Japan.
The study tested red insect nets against conventional white and black nets on fields of Kujo leeks, a traditional Japanese variety of Welsh onion. The target pest was the onion thrips, a tiny but destructive insect that causes significant crop losses and typically requires repeated insecticide applications to control.
The results were clear. Red nets significantly outperformed white and black alternatives at deterring thrips, with the color itself appearing to act as a visual deterrent that discourages the insects from entering the protected area in the first place.
The practical benefit extends beyond just pest deterrence. Because the color is doing part of the work, farmers can use nets with larger mesh openings than they would otherwise need. Larger openings mean better airflow through the crop, more sunlight reaching the plants, and lower risk of heat stress and humidity buildup that finer mesh nets can create.
Field trials found that the red net approach could reduce insecticide applications by between 25 and 50 percent compared to conventional methods, a significant reduction with direct benefits for soil health, pollinating insects, farm costs, and the health of farm workers handling the chemicals.
The research adds to a growing body of work exploring how simple, low-tech modifications to existing farming practices can reduce chemical dependency without sacrificing yield.
