Apparently (and probably unsurprisingly) weed/grass killers like Roundup can also affect bees:

https://beyondpesticides.org/dailynewsblog/2021/04/roundup-s...

Roundup also seems to be bad for humans, which is probably why it has been the subject of various lawsuits and settlements and is also banned or restricted in a number of US cities, though not yet in the US as a whole.