An article published this year in Annual Review of Public Health describes how the existing literature regarding pesticide exposure in farmworkers is working and that future research into the area is needed. 

Pesticide exposure is a significant occupational health problem for farmworkers. In the United States, it is estimated that approximately 1 billion pounds of pesticides are used annually by the United States agricultural system. Immediate consequences of excessive exposure to pesticides are acute toxicity or poisoning. It is estimated that between 10,000 and 35,000 farmworkers suffer from acute pesticide poisoning annually in the United States. The long-term consequences of pesticide exposure may be a more significant problem, though. Studies have found associations between pesticide exposure and cognitive and behavioral issues and some cancers. The problem of pesticide exposure is not confined to the farmworker. Pesticides can pass along to household contacts from skin and clothing that the farmworker brings back to the household returning from work. 

What can be done to help reduce pesticide exposure among farmworkers? Education and proper use of personal protective equipment can help reduce exposure to pesticides.

Reference:

Environmental Health Threats to Latino Migrant Farmworkers. Federico Castillo, Ana M. Mora, Georgia L. Kayser, Jennifer Vanos, Carly Hyland, Audrey R. Yang, Brenda Eskenazi. Annual Review of Public Health 2021 42:1, 257-276