It takes a team from New Zealand to figure out that the US has its pesticide regulation wrong: toxins don’t act in the wild as they do in the carefully controlled and designed lab dosings. Sounds reasonable, right? Well, a recent article in the Journal of Applied Ecology by Kelly et al. was the first to describe Roundup’s ability to act synergistically with a parasitic worm. Commercial formulations of Roundup, the most commonly used herbicide in the world, were found to increase the production of a parasitic worm’s (Telogaster opisthorchis) while at the same time decreasing a fish’s (Galaxias anomalus) immune system’s ability to fend off the parasite.