Over 400 chemical pesticides are routinely used in conventional farming and residues are often present in non-organic food. The UK government has recently found high levels of pesticide residues in baby food, spinach, dried fruit, bread, apples, celery, and chips. The average conventionally-grown apple has 20-30 artificial poisons on its skin, even after rinsing.
Organic produce is not covered in a cocktail of such poisonous chemicals.