Grubs of the giant palm weevil, Rhynchophorus palmarum, and the peach palm, Bactris gasipaes, being sold for food. The grubs are being offered both fried and boiled. Belen Market, Iquitos, Peru. The grubs feed on the fibrous wood of many palm species, frequently killing or severely damaging the tree. These insect grubs are considered a delicacy in the region and thought to aid in treating digestive disorders.