According to a recent study, changing the coloring of Ag nets can dramatically lessen insect damage. Is this a practical approach for you as a farmer?
The study goes on to explain that red nets may offer superior protection against certain agricultural pests compared to traditional black or white nets, although some skepticism may be warranted.
In the study, researchers investigated the efficacy of red, white, black, and mixed-color nets in repelling onion thrips from consuming onion crops. Both laboratory and field experiments demonstrated that red nets were notably more effective at deterring insects compared to other colors. Additionally, field trials revealed that onion crops shielded by either partially or fully red netting required 25-50% less insecticide than those left completely exposed.
The findings propose a potential shift from conventional black or white nets to red ones in agricultural practices, suggesting a promising avenue for reducing pesticide cost and its possible associated environmental repercussions. According to the experimenters though, further field validation is necessary before making any exact claims.
There have been some “home experiments” years ago, that may have inspired this testing, but this research appears to have advanced that.
The professor testing the experiment, Professor Masami Shimoda, had this to say:
“We tested red nets which had a mesh size that was larger than the insect body, but still more effective than other conventional black or white nets with a smaller mesh size. This ‘optical pest control’ relies on the nature of insect color vision to keep pests away. Most insects don’t have red photoreceptors in their eyes, and it is difficult for them to see the color red, so we found it curious that an invisible color can be used to control them.”
It is worth mentioning though that the nets are more expensive in the short term. Shimoda states, “These new red nets are more expensive than pesticides, but they are economical because they can be used for years. They are also very effective in controlling pests without all the work involved in spraying…” And again, further testing may be needed – especially for different crops, areas, etc.
What seems to make them so economical according to the study is that they also can afford to have a larger mesh size. This is supposed to allow for better crop breathability while reducing fungal issues, as it allows for more light exposure.
