Rice weevil

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Rice weevil

  1. 1. K.H.P. Rathnaweera A. M. S. L. Atapattu K. M. Jayasingha P. K. P. N. Shyamalee
  2. 2. Introduction • Kingdom: Animalia • Phylum : Arthropoda • Class: Insecta • Order: Coleoptera • Family: Curculionidae • Genus: Sitophilus • Species: S. oryzae Binominal name:Sitophilus oryzae
  3. 3. Habitat • Rice weevils are usually found in,  Grain storage facilities Food processing plants Food markets
  4. 4. Morphology and structure Adult rice weevil; • 2mm in length • Has a long snout • Dull reddish brown to black with irregular shape pits on thorax • 4 reddish spots on elytra
  5. 5. Larvae; • Legless, humpbacked • White to creamy white in colour • Has a small tan head Pupa; • White in colour • Appendages free • Segments are movable
  6. 6. Life cycle
  7. 7. Behavior • Rice weevils are internal feeders. • The female uses her strong mandibles to chew a small hole in a grain kernel. • Rice weevils are active fliers.
  8. 8. Damage • The larva feeds within the kernel and consumes the endosperm. • The adult leaves a large, ragged exit hole in the kernel and feeds on damaged kernels. • The rice weevil adult gathers and reproduces in stored grains.
  9. 9. Damaged foods • Rice • Wheat • Corn • Macaroni • Oats • Barley • Sorghum • Kaffir seed • Buckwheat • Rye
  10. 10. Control • Removal of infested food products. • Discarding the heavily infested material. • Repackaging material in new containers. • Vacuuming kitchen cabinets. • Products are placed in the freezer for several weeks. • Clean bins regularly.
  11. 11. • Treat bins with a registered insecticide. • Properly dispose of any grain debris found outside of the storage area. • Fumigation. • Apply insecticide. • Lower the temperature of the commodity to at least -5°C for a minimum of 12 weeks.

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