Yes (ish), this meta-analysis proved a strong correlation between exposure to pesticides and likelihood of developing Parkinson's. Note, there is no direct X level of exposure leads to Y likelihood, just a strong correlation.
"Although the risk of PD increased with increased duration of exposure
to pesticides, no significant dose-response relation was established,
and no specific type of pesticide was identified. Our findings suggest
that exposure to pesticides may be a significant risk factor for
A meta-analysis of Parkinson's disease and exposure to pesticides.
Priyadarshi A, Khuder SA, Schaub EA, Shrivastava S. Neurotoxicology.
A more recent meta-analysis reviewed the aforementioned meta-analysis and while criticising some of the limitations of the study (in particular the heterogeneity of the included trials) concluded:
The literature supports the hypothesis that exposure to pesticides or
solvents is a risk factor for PD. Further prospective and high-quality
case-control studies are required to substantiate a cause-effect
relationship. The studies should also focus on specific chemical
(Pezzoli G et al. Exposure to pesticides or solvents and risk of
Parkinson disease. Neurology. 2013 May 28;80(22):2035-41. doi: 10.1212/WNL.0b013e318294b3c8.)