A Smell That Says “Not This Field” — UC Riverside on Bee Repellents

A good piece of news came out of UC Riverside a couple of weeks back, and it’s the kind that makes a backyard beekeeper sit up. A team there used machine learning to hunt for smells that honey bees don’t like, with the idea that a scent mixed in with a pesticide could keep foragers away from a treated field instead of walking right into it.

The hard part, they explain, is that a bee’s nose is a marvel. Honey bees have more than 200 odor receptors, and nearly everything they smell is pulling them toward food, not pushing them away. So Anandasankar Ray’s lab, working with Boris Baer’s bee lab, trained a computer model on the chemical shapes of odors and on how bees had actually reacted to them. Then they let it loose on more than 50 million compounds. It came back with about 130 candidates.

Here’s the part I like best. They didn’t stop at the computer. Bees in the lab backed away from the top picks, just like the model said they would, and out in the field, with free-flying bees, all seven compounds they tested kept bees off honey combs without hurting them. The paper is in the journal eLife.

Now, both eyes open. This is research, not a jug on the feed-store shelf. The work was funded through a grant backed by BASF, and the researchers hold a patent application and stakes in companies tied to the compounds, which UCR says plainly. That doesn’t make it wrong. It just means I’ll want to see it hold up in real farm use before I get excited about it.

Down here in Brazoria County our bees fly over a lot more than flower beds: pasture, row crops, ditches, yards, and the mosquito trucks rolling through on summer nights. Until something like this shows up on a label, my plan stays the same: know my neighbors, ask about spray timing when I can, keep clean water near the hives so the girls aren’t drinking out of somebody’s puddle, and watch the entrances for a sudden pile of dead bees. If a repellent can someday tell a forager “not this field” before she ever lands, I’ll be glad to hear it.

Read it from the source: Machine learning helps identify chemicals that repel honey bees from pesticides (UCR News, September 24, 2026), and the study in eLife.

Back in the yard: month-by-month work and the rest of the journal.