According to the Environmental Working Group, these are the "Dirty Dozen" of foods most likely to contain pesticides:
1. Celery
2. Peaches
3. Strawberries
4. Apples
5. Blueberries
6. Nectarines
7. Bell peppers
8. Spinach
9. Cherries
10. Kale/collard greens
11. Potatoes
12. Grapes (imported)

Be sure to scrub these before eating OR buy organic.