Refer to the Environmental Working Group Dirty Dozen and Clean Fifteen lists updated each year in order to know which produce you should purchase organically and which you can save your pennies and purchase conventionally due to low to no pesticides.
The EWG's Shopper’s Guide to Pesticides in Produce™ is a handy guide that helps you avoid the Dirty Dozen, the non-organic fruits and vegetables that are highest in pesticide residues – and choose non-organic items from the Clean Fifteen List.
Highlights of the Dirty Dozen™ for 2016. EWG singles out produce with the highest pesticide loads for its Dirty Dozen™ list. This year, includes strawberries, apples, nectarines, peaches, celery, grapes, cherries, spinach, tomatoes, sweet bell peppers, cherry tomatoes, and cucumbers.
There's an App for that and you should use it! http://www.ewg.org/apps/
