↑"Pesticides in Organic Farming". University of California, Berkeley. 喺2014-06-17搵到. Organic foods are not necessarily pesticide-free. Organic foods are produced using only certain pesticides with specific ingredients. Organic pesticides tend to have substances like soaps, lime sulfur and hydrogen peroxide as ingredients. Not all natural subshtances are allowed in organic agriculture; some chemicals like arsenic, strychnine, and tobacco dust (nicotine sulfate) are prohibited.