Found these tiny white barrel-shaped things neatly lined up on the underside of a leaf. They look like a microscopic drum set. Should I be worried?

because the female lays them so evenly. That neat arrangement is one of the biggest clues. If you’re seeing a compact patch of little upright barrels arranged like a honeycomb grid, stink bugs are high on the list.

2. Why they look so weirdly perfect up close

Nature can be unsettlingly precise. Stink bug eggs have flat tops and rounded sides, which is why people describe them as barrels, drums, kegs, or tiny lidded jars. Under very close inspection, the tops may even look like they have a ring or crown