For the "Dirty Dozen", I always buy organic. These carry the highest pesticide load. Fortunately, I have over half of the list growing in my garden.
DIRTY DOZEN:
1. Celery
2. Peaches
3. Strawberries
4. Apples
5. Domestic blueberries
6. Nectarines
7. Sweet bell peppers
8. Spinach, kale...