Here's the most recent list of various foods and their pesticide contents.
The Dirty Dozen
Highest in Pesticides - Buy these organic
Celery Peaches Strawberries Apples Blueberries Nectarines Bell Peppers Spinach Cherries Kale/Collard Greens Potatoes Grapes
The Clean 15
Lowest in Pesticides
Onions Avocados Sweet Corn Pineapples Mangoes Sweet Peas Asparagus Kiwis Eggplant Cantaloupe Watermelon Grapefruit Sweet Potato Honeydew
Source : www.foodnews.org