Here are a number of foods known to be associated with high pesticide use during commerical farming practices. The best option is to eat organically grown versions of these foods, or at the very least, to eat the lower-pesticide alternatives provided.

High-pesticide food: Strawberries
Main nutrient: Vitamin C
Healthy alternatives: Blueberries, raspberries, oranges, grapefruit, kiwifruit, watermelon

High-pesticide food: Bell peppers
Main nutrient: Vitamin C
Healthy alternatives: Green peas, broccoli, romaine, lettuce

High-pesticide food: Spinach
Main nutrient: Vitamins A and C
Healthy alternatives: Broccoli, Brussels sprouts, asparagus

High-pesticide food: Cherries
Main nutrient: Vitamin C
Healthy alternatives: Oranges, blueberries, raspberries, kiwifruit, blackberries, grapefruit

High-pesticide food: Peaches
Main nutrient: Vitamins A and C
Healthy alternatives: Nectarines, watermelon, tangerines, oranges, grapefruit

High-pesticide food: Mexican cantaloupe
Main nutrient: Vitamins A and C and potassium
Healthy alternatives: U.S. cantaloupe grown from May to December, watermelon

High-pesticide food: Celery
Main nutrient: Carotenoids
Healthy alternatives: Carrots, broccoli, radishes, romaine lettuce

High-pesticide food: Apples
Main nutrient: Vitamin C
Healthy alternatives: Watermelon, nectarines, bananas, tangerines

High-pesticide food: Apricots
Main nutrient: Vitamins A an C and potassium
Healthy alternatives: Nectarines, watermelon, oranges, tangerines

High-pesticide food: Green beans
Main nutrient: Potassium
Healthy alternatives: Green peas, broccoli, cauliflower, Brussels sprouts, potatoes, asparagus