Odontotermes obesus is one of the termite species that grows fungi, called Termitomyces, in their mounds. Workers collect dead leaves, wood, and grass to stack them in underground fungus gardens called combs. There, the fungi break down the tough plant fibers, making them accessible for the termites in an elaborate form of symbiotic agriculture.

Like any other agriculturalist, however, the termites face a challenge: weeds. “There have been numerous studies suggesting the termites must have some kind of fixed response—that they always do the same exact thing when they detect weed infestation,” says Rhitoban Raychoudhury, a professor of biological sciences at the Indian Institute of Science Education, “but that was not the case.” In a new Science study, Raychoudhury’s team discovered tha

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