The Grain Marketing Board offers fumigation services to clients as a commercial service. The primary purpose of fumigation is to control insects, their eggs, larvae, and pupae in stored produce. Since fumigants are highly toxic to mammals, they also have a beneficial effect on rodents. However, this also means that fumigants are extremely toxic to humans, so fumigation can only be carried out by well-trained staff. When applied correctly, fumigants are highly effective. The small gas molecules easily penetrate large stacks and reach individual grains, effectively killing all stages of pest development.