The Environmental Working Group’s FoodNews site published a report card on Pesticides in Produce. The dozen most-contaminated and least-contaminated fruits and vegetables are listed. They’ve produced a convenient downloadable wallet guide too.
What about washing?… Washing fresh produce may help reduce pesticide residues, it clearly does not eliminate them. Nonetheless, produce should be washed before it is eaten because washing does reduce levels of some pesticides. However, other pesticides are taken up internally into the plant, are in the fruit, and cannot be washed off.