In the middle of a riffle on the Madison River, Jackson Birrell is sprawled across river rocks, pushing all his weight on a metal bucket. He’s looking for bugs.

When a fruit fly catches a whiff of a ripe peach, it quickly heads toward it. Time after time, it finds the fruit—even from ...

Invasive pests can hide in places you’d never expect, and once they spread, they can destroy the trees, plants and food ...