In the case of fruit or vegetables which cannot be successfully disinfected the inspector may grant to the owner or person in charge thereof a written permit to use the condemned products for stock feed, or manufacture the same into by-products, or ship them to a by-product factory; and it is unlawful for the person receiving such permit to sell or dispose of such products without first having the same manufactured into a by-product or shipped to a by-product factory, or to divert any such shipment when made, or for the consignee of such shipment to sell or dispose of the same until it is manufactured into a by-product.