Eating organic is good if you can afford it. However, if you cannot afford to buy all organic produce, the 12 foods that have the most contamination by pesticides according to the EWG, is best to buy organic.
Can contain 10 or more pesticides
Contains the pesticide permethrin
Can contain at least 2 different pesticides
Contains
Contains about 5 pesticides
Most peaches were found to have pesticides
About 5 pesticides were found on cherries
Contains pesticides and fungicides
Several pesticides were found on tomatoes
Most celery tested had pesticides
Has large amounts of the pesticide chlorpropham
Most sweet peppers tested positive for posticides
Almost 75% of peppers has pesticides
For more details about the Environmental Working Group (EWG) and their mission please go to their website.