peaches
apples
bell peppers
celery
nectarines
strawberries
cherries
pears
imported grapes
spinach
lettuce
potatoes
Of coarse it is the stuff we eat most often so, as always, apply where you can.
Good news though onions, avocado, frozen sweet corn, pineapples, mango, asparagus, frozen sweet peas, kiwi, bananas, cabbage, broccoli and papaya are the "cleanest". So they are fine to buy conventional if you have to choose.