Tekmar Talk Blog

The Dirty Dozen: List of Fruits and Vegetables that Have the Highest Pesticide Residue

Posted by Betsey Seibel on Fri, Aug 17, 2018 @ 03:15 PM

The Environmental Working Group published its annual Dirty Dozen list of the 12 fruits and vegetables with the highest pesticide residue. Topping the list the last five year were apples, but this year, strawberries were the most contaminated.

Fruits and Vegetables

According to an EWG news release about the 2016 Shopper’s Guide to Pesticides in Produce, “Nearly all strawberry samples - 98 percent - tested by federal officials had detectable pesticide residues. Forty percent had residues of 10 or more pesticides and some had residues of 17 different pesticides. Some of the chemicals detected on strawberries are relatively benign, but others are linked to cancer, reproductive and developmental damage, hormone disruption and neurological problems.

“Strawberries were once a seasonal, limited crop, but heavy use of pesticides has increased yield and stretched the growing season. In California, where most U.S. strawberries are grown, each acre is treated with an astonishing 300 pounds of pesticides. More than 60 pounds are conventional chemicals that may leave post-harvest residues but most are fumigants - volatile poison gases that can drift into nearby schools and neighborhoods.”

Approximately ¾ of the 6,953 produce samples tested by the USDA in 2014 were contaminated with pesticide residues. The USDA found 146 different pesticides on the samples it tested. The residues persisted on fruit even after they were washed and peeled.

The following is the complete list of EWG’s Dirty Dozen:

  1. Strawberries
  2. Apples
  3. Nectarines
  4. Peaches
  5. Celery
  6. Grapes
  7. Cherries
  8. Spinach
  9. Tomatoes
  10. Sweet bell peppers
  11. Hot peppers
  12. Kale/Collared greens


Some of the key findings of EWG’s study include:

  • More than 98 percent of strawberry samples, peaches, nectarines, and apples tested positive for at least one pesticide residue.
  • The average potato had more pesticides by weight than any other produce.
  • A single grape sample and a sweet bell pepper sample contained 15 pesticides.
  • Single samples of strawberries showed 17 different pesticides.


In addition to its Dirty Dozen list, EWG also publishes an annual list of the Clean Fifteen, which is a list of produce least likely to have pesticide residues. Leading the list is avocado. Only one percent of avocados had detectable pesticides. In addition,

  • Some 89% of pineapples, 81% of papayas, 78% of mangoes, 73% of kiwi and 62% of cantaloupes had no residues.
  • No single fruit sample from the Clean Fifteen™ tested positive for more than 4 types of pesticides.
  • Multiple pesticide residues are extremely rare on Clean Fifteen™ vegetables. Only 5.5% of Clean Fifteen samples had two or more pesticides.

EWG’s Shoppers Guide to Pesticides in Produce has been published annually since 2004. The report is based on more than 35,200 samples tested by the USDA and FDA.

Teledyne Tekmar’s  AutoMate-Q40 is specifically designed to automate the most popular QuEChERS sample preparation workflow, AOAC 2007.01 and EN 15662.2008. Currently, the AutoMate-Q40 system is used in numerous labs around the world to determine pesticide levels on plants, as well as measure levels of dyes, and other ingredients in food and liquids. Visit TeledyneTekmar.com to review various application notes about the AutoMate-Q40 system.

Interested in more   information on the   Automate-Q40

Tags: Pesticide Residue

Subscribe via E-mail

Latest Posts

Posts by category

Follow Me