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The red palm weevil (RPW), Rhynchophorus ferrugineus is the major pest of the palms that originate from Southeast Asia and Melanesia. Although RPW is an economic important pest there is still no study conducted on its digestive morphology and mechanisms that relates majorly for the destruction of the palm trees. This study has been conducted to understand the alimentary system of the red palm weevil larvae. RPW larvae is known to be the most vicious as it is active at this developmental stage as its feeding activity on the stem contributes to the destruction of the palm tree. Samples were taken from Terengganu, Malaysia and reared in the laboratory. The result revealed that the alimentary tract is consists of three part; foregut, midgut and hindgut with foregut, consist of an oesophagus, crop and proventriculus. The crop is having the largest portion in the foregut, supporting its role in storing the solid food of active feeding larvae. The proventriculus lies at the posterior of foregut the site where the solid food will grinded into small pieces. The midgut is the longest part of the alimentary tract, coiled inside the abdominal segments. The ventriculus of the midgut is covered with the projection of criptae papillae on the surface. The midgut epithelium can be characterized by the present of the columnar cell, goblets cell, villi and peritrophic membrane. The hindgut is located at the most posterior part of the alimentary tract that consist of the ileum, Malpighian tubule, colon and rectum. Another significant finding is the arrangement of the Malpighian tubule for RPW are classified as cryptonephridial type of arrangement based on the histology result, it is fused into the ileum and the colon, located between the ileum and the rectum of the larvae. There might be a potential solution for RPW infestation through the understanding if their digestive system.

Morphology and Histology of the Digestive System of the Red Palm Weevil Larva, Rhynchophorus ferrugineus, Olivier (Coleoptera: Dryophthoridae)