Scientists applied permethrin to soil and after that grew sugar beets, wheat, lettuce and cotton in the dirt. Researchers discovered trace amounts of the permethrin deposit in the edible parts of the plants at 30 as well as 120 days after growing. Trace quantities of permethrin have been located in foods including bananas, collard environment-friendlies, squash as well as watermelon. However, much less than 1% of the greater than 1,700 food samples checked had detectable degrees of permethrin.