A research has showed that farmers who used agricultural insecticides experienced increased neurological symptoms, even when they were no longer using the products.

Data from 18,782 North Carolina and Iowa farmers linked use of insecticides, including organophosphates and organochlorines, to reports of reoccurring headaches, fatigue, insomnia, dizziness, nausea, hand tremors, numbness and other neurological symptoms.

Some of the insecticides addressed by the study are still on the market, but some, including DDT, have been banned or restricted.

The research is part of the ongoing Agricultural Health Study funded by the National Institute of Environmental Health Sciences and the National Cancer Institute, two of the National Institutes of Health, and the Environmental Protection Agency.

The NIEHS ( National Institute of Environmental Health Sciences ) researchers examined questionnaires completed by farmers on lifetime exposure to herbicides, insecticides, fungicides, and fumigants, and their history of 23 neurological symptoms.
Those who reported experiencing more than 10 symptoms during the year prior to completing a study questionnaire were classified as having high levels of symptoms.

Researchers found that nearly 3,000 participants had a high lifetime exposure to insecticides: they used insecticides more than 500 days in their lifetime.
Nearly 800 of these farmers reported more than 10 neurological symptoms compared to those using insecticides fewer than 50 days.

The researchers found no significant association between neurological symptoms and other chemicals, including herbicides or fungicides, and only a weak association between fumigant exposure and neurological symptoms.

Some of the insecticides used by the licensed farmers over the past 25 years are no longer available commercially.
DDT, a well known example of an organochlorine, has been banned for use in the US since 1972.
Organophosphates, such as malathion, chlorypyrifos, and diazinon, have been banned or restricted for home and garden use in the US.

However, some of the pesticides examined, including carbaryl and some pyrethroids, are available to home gardeners, although in different formulations and in lower concentrations, which may make them less hazardous.

Source: NIH, 2005


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