Another DUH! moment:

Pesticide Exposure Found To Increase Risk Of Parkinson's Disease

http://www.sciencedaily.com/releases...0421091705.htm

ScienceDaily (Apr. 20, 2009) — The fertile soil of California's Central Valley has long made it famous as one of the nation's prime crop-growing regions. But it's not just the soil that allows for such productivity. Crops like potatoes, dry beans and tomatoes have long been protected from bugs and weeds by the fungicide maneb and the herbicide paraquat.