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Its gammaproteobacterial symbiont Candidatus Sodalis pierantonius str. SOPE is able to supply rice weevil with essential vitamins like pantothenic acid, riboflavin, and biotin. [7] During larvae development, bacteria rely on up-regulation of type three secretion system genes and genes for flagellum so they can infect insect stem cells.
The pearly white eggs are cylindrical (0.8 mm long and 0.14 mm long) of pearly with a very thin corion. The eggs are laid in the leaf sheath and sometimes in the roots. Larvae hatch from eggs after 4–9 days. The larvae are aquatic and live their entire lives in the rhizosphere. They are white and grow up to 1 cm long at 4th instar stage.
The adult rice weevil has an orange-black exoskeleton and lays up to 450 eggs in pores of the damaged grains with each hatched egg further damaging the grain from the inside. Similarly to the lesser grain borer, maturation also happens inside the grain with the matured adult rice weevil eating through the husk of the grain to get out.
The wheat weevil can live on acorns, and may have used them as a host before agriculture made grain plentiful. The rice weevil can live on beans, nuts, grains, and some types of fruit, such as grapes. [7] Several other Sitophilus use the acorns of oaks such as bluejack oak (Quercus incana) and moru oak (Q. floribunda).
Rice_weevil_top_view.JPG (768 × 269 pixels, file size: 139 KB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The maize weevil (Sitophilus zeamais), known in the United States as the greater rice weevil, [1] [2] is a species of beetle in the family Curculionidae. It can be found in numerous tropical areas around the world, and in the United States, and is a major pest of maize . [ 3 ]
A weevil's rostrum, or elongated snout, hosts chewing mouthparts instead of the piercing mouthparts that proboscis-possessing insects are known for. The mouthparts are often used to excavate tunnels into grains. [1] In more derived weevils, the rostrum has a groove in which the weevil can fold the first segment of its antennae.
Download QR code; Print/export ... known generally as the Sri Lanka weevil or yellow-headed ravenous weevil, ... 1– 4. O'Brien, Charles W.; Wibmer, Guillermo J ...