Children and Crops - Pesticide Combinations

Recent independent findings of higher than acceptable pesticide residues in strawberries from conventional farms (Choice magazine, February 2008) highlight the potential for chemical abuse in all produce. "Chemical cocktail" mixes are shown to be of particular concern for parents and growing healthy crop plants, warns Australia's largest organic representative group, Biological Farmers of Australia (BFA).
Choice magazine's independent research found from conventional strawberry samples, three contained pesticide residues at levels above the acceptable MRL's (maximum residue levels), three had pesticides that regulations don't allow, two contained more fungicide than is acceptable under stringent EU regulations, and seventeen strawberries had combination residues of more than one pesticide.
Out of four organic samples tested, one contained fungicide residues at less than 1% of the MRL. Researchers state this may have come from chemical spray drift.
Their conclusion? "If you want to minimise your family's exposure to pesticides, organic is the way to go. Tests have repeatedly found lower levels of pesticide residues in organic produce."

Soil health technician and BFA spokesperson, Mr Greg Paynter, says the mixed use of pesticides, insecticides, herbicides, rodenticides, and fungicides weaken crops in the long-term when applied in un-tested combinations at the discretion of farmers.

"Excessive residue levels are a problem, but what may be more concerning and are also carried through to the end consumer, are the unknown effects of blends of different types of synthetic farming inputs. The toxic permutation that occurs as a result is unidentified and untested with regards to human or eco-health, because standard practice is to test a chemical product in isolation," says Mr. Paynter.

Adverse effects on health from low doses of agricultural chemical combinations have been recorded in the past, with a particularly negative response from tested animals in the pairing of Atrazine - a herbicide widely used on maize and sorghum - with nitrate fertilizer.

Mr. Paynter said chemical mixes damage a crop's ability to respond naturally to growth obstacles, and often lead to changes in plant metabolism, physiology, chemical composition and nutritional patterns.

"Plants which take up one particular pesticide will then inevitably be exposed to other environmental problems with a weakened natural defence system. A farmer who began using one type of pesticide may be forced to apply an additional herbicide, and then another type of pesticide to compensate for a vulnerable crop (for example)," he says.

"Organic growers, in comparison, tend to utilise the design of ecosystem services to replace the use of synthetic inputs in their farming practice."

There are around 8,700 registered agricultural and veterinary products used in Australia, a number subject to fluctuation daily.

Children are the other party most susceptible to high toxicity levels from chemical blends, according to BFA Nutritionist Shane Heaton. "Children are more vulnerable to food toxins than adults - they have a larger intake of food per kilo of body weight than adults, and immature organs and detoxification and immune systems," he says.

According to the 20th Australian total diet survey in 2003, dietary exposure to pesticide residues is highest for the toddler age group. Mr. Heaton said pesticides had proven effects on developing cognitive systems.

Adding to this he says "A study in South America showed impaired cognitive ability in children (aged four and five) from a village that routinely used farm pesticides - they had a lower capacity for things like hand-eye co-ordination and short term memory, and less ability for play-based learning tasks like drawing a recognisable person, or catching a ball."

Mr Heaton said concerned parents could opt for organic to reduce their child's exposure to chemicals - children eating a predominantly organic diet have been proven to have less (one-sixth) the level of pesticide metabolite in their urine than those who don't.

"At the end of the day it's about peace of mind in parenting - organic choices reduce transferred chemical risk from 'uncertain' to negligible," he says.

Want to know more about the independent Choice magazine study? Go to http://www.choice.com.au/viewArticle.aspx?id=106157&catId=100286&tid=100008

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