Scientists used permethrin to dirt and after that planted sugar beets, wheat, lettuce and also cotton in the dirt. Scientists discovered trace amounts of the permethrin residue in the edible parts of the plants at 30 and 120 days after growing. Trace quantities of permethrin have actually been discovered in foods including bananas, collard environment-friendlies, squash as well as watermelon. However, less than 1% of the greater than 1,700 food samples tested had noticeable levels of permethrin.