roundup - glycosphate - is used extensively in agriculture, it might be the #1 herbicide around the world especially since MONSANTO manufactures it and since the patent has expired so do other companies. MONSANTO has made billions on it especially after incorporating a gene into corn, soybeans and other crops that make them immune to ROUNDUP which is a non-selective herbicide, kills broadleaf plants and grasses. it's the cheapest way to control weeds and interestingly enough, the most climate friendly in terms of burning fossil fuel since farmers don't have to use old fashioned mechanical weed control, namely tilling the fields with a tractor to bury the weeds. just spray and pray

thanks for your post, i also am a news junkie on pd but concentrate more on treatments and neuroprotection than on trying to eliminate possible environmental causes, i guess because there isn't much news on that or scientists calling for a ban in the news so i forget about it - i have pd . for some reason alarm bells don't go off in my head when i read about the possible link between pesticides/herbicides and pd and they should for exactly the reasons you mentioned. banning these chemicals would significantly raise the cost of food so one has to be very certain they increase the chances of getting pd.