1. ApplesThis 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]
2. Celery
3. Strawberries
4. Peaches
5. Spinach
6. Nectarines (imported)
7. Grapes (imported)
8. Sweet Bell Peppers
9. Potatoes
10. Blueberries (domestic)
11. Lettuce
12. Kale/collard greens
13. Cilantro
14. Cucumbers
15. Grapes (domestic)