1. Apples2. Celery3. Strawberries4. Peaches5. Spinach6. Nectarines (imported)7. Grapes (imported)8. Sweet Bell Peppers9. Potatoes10. Blueberries (domestic)11. Lettuce12. Kale/collard greens13. Cilantro14. Cucumbers15. Grapes (domestic)This list is from the Environmental Working Groups "2011 Shopper's Guide To Pesticides in Produce." For more (including a list of the cleanest) see: [pdf]