To inform pest management techniques and fight threats like Citrus Greening disease, Walter Leal and his colleagues use reverse chemical ecology to identify sex pheromones in insects. From Brazil to Japan to Davis, Calif., Leal's research path has been unique. 

In a study appearing in Science, researchers show that the pesticide imidacloprid, which has been sold in the U.S. since 1994, disrupts bumblebee (Bombus impatiens) nest behavior, causing reduced growth in exposed colonies.