The top 13 fruits and vegetables you should probably buy organic

Spinach ranked 8th in EWG's 2016 "dirty dozen" list but moved up six spots this year.

"Spinach samples had, on average, twice as much pesticide residue by weight than any other crop," according to EWG.

About 49 out of 50 apples sampled by the USDA also tested positive for at least one kind of pesticide residue.

Pears moved up from #22 to #6 in just a year because pesticide use has doubled on the crop since 2010.

While EWG says hot peppers don't meet its "traditional ranking criteria," it noted that "USDA tests of 739 samples of hot peppers in 2010 and 2011 found residues of three [...] insecticides — acephate, chlorpyrifos and oxamyl — on a portion of sampled peppers at concentrations high enough to cause concern. These insecticides are banned on some crops but still allowed on hot peppers."