Study shows pesticides can impact generations of bees

The most important thing people can do to help bee populations is reduce their pesticide usage around bees as much as possible. Pixabay

A recently released study by researchers at the University of California, Davis revealed that pesticides can have lasting affects on bee health, reducing their reproduction rate.

According to the findings, published in the Proceedings of the National Academy of Sciences, multiple generations of bees may be needed to recover from one pesticide application.

Here’s a rundown of the study and what you can do to save the bees.


The study was conducted by exposing blue orchard bees to imidacloprid, a common insect control chemical, with the label’s recommended amount. The bees were given one application for two years, which is a standard level of exposure, according to the UC Davis article.

“Repeated exposure across two years had an additive negative effect on individual reproduction, which led to a really dramatic reduction in population growth,” said Clara Stuligross, the study’s lead author.

Researchers concluded that bees that came into contact with insecticides as larvae and as adults produced 44% fewer brood. And bees that were exposed to the chemical two years straight had a 72% reduced population growth rate, compared to bees that did not have any level of exposure.


The research was based on the use of imidacloprid, an insecticide that mimics nicotine, which is toxic to insects. This chemical is the most widely used for insect control.

Stuligross, who is a UC Davis Ph.D candidate in ecology, said that because there is a large variety of insecticides in the market, you can’t extrapolate the study’s results. But she thinks the effects of imidacloprid on bees will be reflective across similar types of pesticides.

“It also helps us understand, generally, the effects of multiple exposures to pesticides,” she said.


According to Planet Bee Foundation, an environmental education non-profit based in San Francisco, bees are the most efficient pollinators in the world. As pollinators, these buzzing insects help plants survive, which, in turn, provides for our food supply, wildlife and environment.

“They’re really important for our ecosystem,” Stuligross said. “And so understanding how this pesticide exposure affects bees over time is important for understanding how to actually support them and how to continue supporting our healthy and sustainable food systems.”


Stuligross said that the most important thing people can do is reduce their pesticide usage around bees as much as possible.

This means not using these chemicals when crops and flowers are in bloom because bees are generally attracted to plants that are flowering with nectar and pollen.

If you must spray an insecticide on a crop, Stuligross said you should reduce any drift of the chemical to nearby plants that are blooming.

As an Amazon Associate I earn from qualifying purchases.

Tribune Wire

Recommended for you

(0) comments

Welcome to the discussion.

Keep it Clean. Please avoid obscene, vulgar, lewd, racist or sexually-oriented language.
Don't Threaten. Threats of harming another person will not be tolerated.
Be Truthful. Don't knowingly lie about anyone or anything.
Be Nice. No racism, sexism or any sort of -ism that is degrading to another person.
Be Proactive. Use the 'Report' link on each comment to let us know of abusive posts.
Share with Us. We'd love to hear eyewitness accounts, the history behind an article.