If you're looking for another reason not to eat spinach or kale, you now have one. The leafy greens are ranked second and third, respectively, on Environmental Working Group's Dirty Dozen, a list of the fruits and vegetables with the most pesticide residue. At the top of the advocacy group's latest roster, released Wednesday, is strawberries; nectarines and apples round out the top five. The group found that more than 90 percent of samples of strawberries, apples, cherries, spinach, nectarines and kale tested positive for residues of two or more pesticides, while multiple samples of kale indicated the presence of 18 pesticides.