Following my post on organophosphates and ADHD, one of my blog readers asked for more information about derris dust (rotenone) that has been popular with organic gardeners for pest control as rotenone is an organic pesticide made from the roots of a tropical plant. It also has a long history as a piscicide (fish killer).
Rotenone works by shutting down energy production in cells, which makes it a neurotoxin. Research linked it with Parkinson’s Disease, but this was largely discounted as the rats in the research had rotenone injected directly into their brains, which is not a very fair trial.
In 2007, the USEPA published a Re-registration Eligibility Decision (RED) assessing only the risks of contact from its use as a piscicide (i.e. swimming in or drinking treated water). The RED stated that small children and foetuses were more susceptible to the effects of rotenone.
According to Environmental Health News, researchers have found that rotenone selectively destroys dopamine-producing cells in petri dishes. (The full document on this research must be purchased).
In 2010, another study was published about research in mice that showed a progression of Parkinson’s-like symptoms after mice were fed low doses of rotenone over a period of time. The research found that concentrations in the central nervous system were below detectable limits, yet still induced Parkinson’s Disease pathology.
Australia’s APVMA has reviewed rotenone and decided that it can still be used as a pesticide. However, both Canada and the United States are phasing out the use of rotenone for everything except its use as a fish poison. In Canada, for example, rotenone could not be sold for livestock, gardening, or domestic pet use after the end of 2008, and existing stocks can’t be used after the end of 2012.
I certainly don’t recommend the use of Derris dust, but gardeners must make their own evaluations of this pesticide.
Earlier this week, ‘Today’ program on Channel 9 aired a segment about new research showing a link between organophosphate pesticides and ADHD. The research involved 1,139 children between 8 and 15 years and found high levels of organophosphate metabolites in urine of children with ADHD. This link is not surprising as organophosphates (and carbamates) are neurotoxins. These pesticides work by affecting the central nervous system, and organophosphates were developed for chemical warfare before being used as pesticides.
Both organophosphate and carbamate pesticides block the action of the enzyme acetyl cholinesterase, which regulates the transmission of nerve messages. Well-established research has shown that chronic exposure to organophosphates induces neurological dysfunction. Children are more susceptible to all toxins, including neurotoxins.
Separate research has linked pesticide exposure with Alzheimer’s disease and Parkinson’s disease. Included in the suspects is the very popular Derris dust, which has also been found to be a neurotoxin.
‘Today’ presenters advised that all fruits and vegetables should be carefully washed before eating. Good advice to be sure, but advice that misses the point that some organophosphate pesticides commonly used on food plants are systemic. Systemic pesticides enter the sap system in plants, are distributed to all parts of the plant, and can’t be washed from our food. As a lot of our food is now imported from countries with differing standards for pesticide regulation, we have no way of knowing whether or not our food contains systemic organophosphates. AQIS carries out testing on only a tiny percentage of imported foods.
Write to your federal Member of Parliament requesting a ban on the use of systemic organophosphate pesticides in local produce, and improved inspections and standards for imported foods. Remind your Member of the cost to the community in treating the problems caused by these pesticides. Where possible, buy organic produce for your children, and grow as much as you can using organic methods. It will not only be healthier – you will notice it tastes better, too.