Not all produce is created (or grown) equally. It is sometimes necessary to spend more to buy organic while other times, conventional carries little risk of pesticides.
List of Most Contaminated Produce (Buy Organic)
Apples
Celery
Cherries
Grapes
Lettuce
Nectarine
Peaches
Pears
Peppers
Potatoes
Strawberry
Spinach
Least Contaminated Produce (Conventional is safe to buy)
Asparagus
Avocado
Bananas
Broccoli
Corn
Kiwi Fruit
Onions
Mango
Papaya
Peas
Pineapples