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21st September 2021 by foodfraudadvisors

Pesticide Residues Found in ‘Organic’ Fruit and Veg

The most recent survey of pesticides in foods (USA) found that more than 98 percent of the tested foods had no or acceptable (safe) levels of pesticide residue. These figures are great overall.  But the results for organic foods are not so good.  Organic fraud is one of the most common types of food fraud.  Karen Constable of Food Fraud Advisors took a deep dive into the results of the survey to see how organic foods performed.

About the Pesticide Data Program

The United States Department of Agriculture (USDA) surveys the nation’s food supplies every year, checking for residues of pesticides, pesticide by-products and environmental contaminants, which are chemicals no longer used as pesticides, but known to persist in the environment.

The 2019 survey tested almost 10,000 samples of 21 types of fresh, frozen and canned fruit and vegetables, plus tomato paste, dried garbanzo beans, rice and oats.  The foods were sampled throughout the year, across the country from wholesale markets, retail outlets and distribution centres.  Both domestic and imported foods were sampled.  Each commodity was tested using sensitive analytical tests to check for residues of approximately 500 pesticides and around 20 environmental contaminants.

The official report (find it here ) contains excellent and detailed information about the sampling systems.  The report also provides a broad overview of results for commodities and discusses the differences between domestic and imported products.  But it does not specifically discuss the results for organic foods.

Results for Organic Foods

In 2019 and 2020 the USDA acknowledged widespread problems with compliance in US organic certification programs.  In the USA, organic certification is regulated by the USDA and their organic program is the only organic certification scheme that may be used.

Among the 9,697 samples that were tested in 2019 by the USDA in their pesticide data program, 845 (8.7%) of them were labeled as ‘organic’.   The pesticide survey is not designed to sample specifically for organic foods and the official report does not report results for organic foods as a category.

However, the raw data from the survey is publicly available and can be analysed to find out which foods were labeled as ‘organic’ but contained residues of non-organic-approved pesticides.

For the 2019 survey there were 845 samples labeled ‘organic’ and two that were labeled ‘pesticide free’.  Both of the products labeled ‘pesticide free’ contained detectable levels of pesticide, but at safe* levels.  Around one quarter of organic-labeled foods contained residue(s) of at least one pesticide and just under half of those had unsafe** levels.  There was a small number of notable samples (1%) that contained either very many residues or unsafe levels of multiple pesticides.

Summary

  • 26% of ‘organic’ samples had detectable levels of pesticide(s)
  • 9% of ‘organic’ samples had unsafe** levels of at least one pesticide
  • 1% of ‘organic’ samples contained four or more pesticides at unsafe** levels
  • 1% of ‘organic’ samples contained traces of more than 10 pesticides

26 percent of ‘organic’ samples had detectable levels of pesticide(s)

Every sample in the USDA survey was tested for approximately 500 pesticides and environmental contaminants.  Of the 845 samples that were labeled as ‘organic’, 220 (26%) contained detectable levels of at least one pesticide.

Note that not all organic-approved pesticides are included in the tests.  The main organic-approved pesticides that were included in 2019 were Spinosad and Spinosad A.

9 percent of ‘organic’ samples had unsafe* levels of at least one pesticide

Of the 845 organic products that were tested, 72 (9%) were found to contain at least one pesticide at levels that exceed or were presumed to exceed the EPA ‘tolerances’ for that pesticide.  The tolerances are ‘the maximum amount of a pesticide allowed to remain in or on a food’.

7 ‘organic’ products contained four or more pesticides at unsafe* levels

There were 7 products (<1%) that were found to contain unsafe levels of four or more pesticides.  Five of those seven products were fresh basil (4 grown in USA, 1 imported from Mexico).  The other products were fresh cilantro (grown in USA) and white basmati rice imported from India.

Only one of those seven products contained detectable levels of the organic-approved pesticides Spinosad or Spinosad A.

5 ‘organic’ samples contained residues of more than 10 pesticides

Of the 845 samples that were labeled ‘organic’, 5 (<1%) contained detectable levels of more than 10 different pesticides.  These five products were locally grown fresh basil, fresh mustard greens, imported basmati rice and imported frozen strawberries.

USDA Pesticide Survey (PDP), 2019; results for foods labeled ‘organic’

How does this compare with previous data?

Click here to view the results for 2014

  2014   2019
Proportion of ‘organic’ samples that contained detectable levels of at least one pesticide   22%   26%
Proportion of ‘organic’ samples that contained at least one pesticide at ‘unsafe’ levels   2%   9%
Worst performing commodities***   Frozen cherries

Tomatoes

  Fresh basil

*** Note that none of these commodities were sampled in both 2014 and 2019

Is this food fraud?

Organic foods should not contain residues of non-organic-approved pesticides.  But the presence of such residues is not necessarily the result of food fraud.

Analytical tests can detect extremely low levels of pesticides.  Low levels of pesticides can be present on samples due to accidental contamination, such as by blowing from another field during application, or by being transferred from other produce during transport or storage.

Where residues are present at higher or unsafe** levels, there is a greater likelihood that the pesticide(s) were applied to the food deliberately.  Interestingly, of the seven ‘organic’ foods that contained four or more pesticides at unsafe levels, all contained multiple other residues at lower levels, but only one contained any residue of the organic-approved pesticide Spinosad/SpinosadA.

A properly controlled organic supply chain should not result in produce that contains non-approved pesticides at unsafe levels.  It is reasonable to assert that such produce has been deliberately treated with the pesticide(s), such as would occur during conventional growing or post-harvest processes.  It would be reasonable to conclude that the products were therefore conventionally grown rather than being authentically organic.

In this survey between 1 and 9 percent of the organic samples appear to have been grown using conventional methods but were marketed as ‘organic’.  This mislabeling represents food fraud.

*safe levels:  For the purposes of this report, ‘safe’ = any analytical result that was reported as being detected but not annotated as being (i) Residue at with presumptive violation – No Tolerance, (ii) Residue with a presumptive violation – No Tolerance (iii), Residue with a presumptive violation – Exceeds Tolerance.  The tolerance is a limit set by the EPA that is ‘the maximum amount of a pesticide allowed to remain in or on a food’.

**unsafe levels:  For the purposes of this report, ‘unsafe’ = any analytical result that was reported as being detected and annotated with either (i) Residue at with presumptive violation – No Tolerance, (ii) Residue with a presumptive violation – No Tolerance (iii), Residue with a presumptive violation – Exceeds Tolerance.  The tolerance is a limit set by the EPA that is ‘the maximum amount of a pesticide allowed to remain in or on a food’.

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Filed Under: Food Fraud, Supply Chain

17th December 2017 by Karen Constable

Where’s my tricorder?

We would all love to have a magic machine that can tell us exactly what is in a food or a health supplement, but our current technology isn’t quite at the level of Star Trek yet.  Here’s a question asked recently on Reddit/foodscience . It follows a common theme for questions asked by entrepreneurs who are investigating food and supplement business opportunities.

Supplement testing

 

Question: How do I test supplements to make sure the ingredients are authentic and organic?

The Reddit poster explained that he had stumbled upon a mix of plant extracts that helped his acne and wants to make and sell a pill with those ingredients.  He writes:  “I sourced some plant extract manufacturers in china but I do want to test the plant extracts to check if they are actually what they are and if they are truly organic. Can someone please point me in the right direction as to how to do that?“.  A food manufacturing expert suggested that he seek a contract manufacturer to make the pills for him, which he said sounded like a good idea.  Then he asked “I’d feel a lot better if there was maybe a machine I could buy to check the composition of what was in there“.

Answer: I think you want a Star Trek Tricorder

I wish it was possible to buy a magic machine that will tell you what is in a product.  On the other hand I am a food/supplement fraud expert so if there was such a thing I wouldn’t have a job.

Organic testing is ‘simple’. Sort of.  To test for ‘organic’ status in a finished capsule supplement you can check that pesticide residues are absent.  There is no technology that allows you to put a pill into a machine and ask it to look for ‘anything’, so you need to ask the machine to look for specific pesticides.  The USDA perform this type of testing every year on fruit and vegetables.  Each sample is tested separately for around 200 different pesticides.  The USDA use a network of independent labs so it should be easy to find a lab that can test your finished product for pesticide.  More on the pesticide testing program here:  https://www.ams.usda.gov/datasets/pdp

Authenticity testing is not simple.

Herb-like ingredients can be tested for authenticity by an expert who looks at them under the microscope.  This only works if they are not ground up too small.

Liquid extracts and soluble powders can be tested using chromatographic methods, such as HPLC and GC.  In these methods the machine creates a chemical ‘fingerprint’ for the material and then compares that to the fingerprint of an authentic sample.  There are two things that make it difficult: firstly you need to find a lab that knows what an authentic sample fingerprint looks like for the material you want to test (they call this ‘having a database’); secondly, these methods are best suited to single ingredients.  Once you mix a whole bunch of ingredients together, if you test the mixture all the chemical fingerprints get mixed up and the machine can’t tell you which peak (which part of the ‘fingerprint’) comes from which ingredient.  There are ways around this but the methods are expensive as the databases are custom-made for each finished product that is to be tested.

Unfortunately it usually comes down to trust in your suppliers and a reliance on their systems and certifications.  Check all certifications to make sure they are not forged as unfortunately that is common in some countries.  Do this by contacting the certifier directly.

Reddit user: Karenconstable4

Want help with supplement authenticity?  Don’t know where to start?
Ask Karen

 

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Filed Under: Authenticity, Consultancy, Food Fraud

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