Researchers applied permethrin to dirt and afterwards grew sugar beetroots, wheat, lettuce as well as cotton in the soil. Researchers located trace quantities of the permethrin deposit in the edible parts of the plants at 30 as well as 120 days after planting. Trace amounts of permethrin have been located in foods including bananas, collard greens, squash and watermelon. Nevertheless, less than 1% of the more than 1,700 food examples tested had noticeable levels of permethrin.