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Every year, the Environmental Working Group publishes its Dirty Dozen list, naming the fruits and vegetables that rank highest in pesticide residue. This year, strawberries remained at the top of the list; a single sample of strawberries showed 20 pesticides. SHAH MARAI/AFP/Getty Images
Spinach jumped into the second spot this year with twice as much pesticide residue by weight than any other crop on the Dirty Dozen list. Four pesticides -- one insecticide and three fungicides -- were responsible for the bulk of the residues detected on spinach. John Moore/Getty Images
Nectarines remained in the third spot on the list. Nearly all samples of strawberries, spinach, peaches, nectarines, cherries and apples tested positive for residue of at least one pesticide, according to the group. Shutterstock
Last year, apples came in at No. 2 after having been a list leader for the past five years. This year, apples fell to the fourth spot on the list. Matt Cardy/Getty Images
Peaches moved down one ranking this year after claiming the No. 4 spot in 2016. Shutterstock
Pesticides on conventionally grown pears have increased dramatically in recent years, according to the latest tests by the USDA. Pears now rank sixth on the list, up from 22nd previously. shutterstoc
Cherries remained at the No. 7 spot on the Dirty Dozen list. Shutterstock
Grapes moved down this year from No. 6 to No. 8, according to the report. Ian Forsyth/Getty Images
Celery fell this year to the No. 9 spot after being ranked fifth last year. Shutterstock
Tomatoes also moved down one ranking this year after claiming the No. 9 spot in 2016.The USDA rotates what food it tests for pesticides with a special focus on produce that kids consume. Joern Pollex/Getty Images/File
Sweet bell peppers remained at the No. 10 spot on the list. Hot peppers may also have pesticide residue, but they made only the expanded list. Sovfoto/UIG via Getty Images
Potatoes cracked the list this year at No. 12. Pears and potatoes were new additions to the Dirty Dozen, displacing cherry tomatoes and cucumbers from last year's list. Joe Raedle/Getty Images
