I discovered this list a few months back and found it very helpful to refer to when shopping for various fresh produce at the Supermarket:
The Shopper’s Guide to Pesticides in Produce™ will help you determine which fruits and vegetables have the most pesticide residues and are the most important to buy organic. You can lower your pesticide intake by avoiding the 12 most contaminated fruits and vegetables and choosing the least contaminated produce.
Genetically modified plants, or GMOs, are not often found in the produce section of grocery stores. Field corn, nearly all of which is produced with genetically modified seeds, is used to make tortillas, chips, corn syrup, animal feed and biofuels. Because it is not sold as a fresh vegetable, it is not included in EWG’s Shopper’s Guide to Pesticides in Produce. Nor is soy, another heavily GMO crop that makes its way into processed food.
The Dirty Dozen include:
Sweet Bell Peppers
Summer squash – Cougettes
Then you have the Clean Fifteen, which include:
Sweet peas – frozen
Overall if you are going to consume any products on the Dirty Dozen list it is best to purchase the organically-grown versions of these items.
For more information on EWG visit: http://www.ewg.org/foodnews/summary.php