What guidance does FDA have for manufacturers of Dried Mushrooms?

Only edible species of dried mushrooms may be offered for import. The most common bar to entry, however, is insect infestation, usually by flies or maggots. Dried wild mushrooms should be handled by people who know how to sort out insect-infested mushrooms and those not clearly identifiable as edible species. If insect infestation is so heavy in a particular growing area that it is impractical to sort out the insect infested ones, then the mushrooms from that area should not be offered for entry. The mushrooms should be protected during drying and storage to prevent their contamination with insects, rodent and bird filth, or other objectionable material. Canned mushrooms should be essentially free of insect infestation. Since the canned product is prepared from domesticated varieties grown under enclosure, the careful producer can readily prevent access by insects.