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Identification of Stored Product Insects

Identification of Stored Product Insects. Internal feeders. Insect groups based on their feeding habits. Commodity feeders External and internal feeders Fungus feeders Scavengers Predators Parasites. Weevils ( Sitophilus spp.) Coleoptera: Curculionidae. Body 2.3 – 4.5 mm long.

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Identification of Stored Product Insects

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  1. Identification of Stored Product Insects Internal feeders

  2. Insect groups based on their feeding habits • Commodity feeders External and internal feeders • Fungus feeders • Scavengers • Predators • Parasites

  3. Weevils (Sitophilus spp.)Coleoptera: Curculionidae • Body 2.3 – 4.5 mm long. • Front of head with snout. • Antennae elbowed and clubbed.

  4. Immature stages of Sitophilus sp. Eggs Larva Pupa

  5. Stages of Sitophilus infestation

  6. Rice, maize and granary weevils • Rice and maize weevils: 4 oval marking on the forewings; small circular punctures on the pronotum • Granary weevil: no markings on the forewings; punctures are widely separated, large and oblong

  7. Y-shaped sclerite of females Punctures on pronotum Aedeagus of males

  8. Lesser grain borer, Rhyzoperthadominica (F.)Coleoptera: Bostrichidae

  9. Body is cylindrical; 2 – 3 mm long • Head invisible (concealed) from above; pronotum has rows of teeth. • Antennae with large, loose 3-segmented club. • Wings have rows of punctures.

  10. Immature stages of R. dominica Larvae Pupa

  11. Bean weevils, Callosobruchus spp.(Coleoptera: Bruchidae) • Characteristic shape • Covered in short hairs • Elytra short and patterned • Long antennae (serrate in some species)

  12. Cowpea weevil, C. maculatus • Adults are 2.0 – 3.5 mm • Male and female’s antennae are slightly serrate

  13. Adzuki bean weevil, C. chinensis: • Adults are 2.0 – 3.5 mm • Male antennae are pectinate; female’s are serrate

  14. Angoumois grain moth, Sitotrogacerealella (Olivier)(Lepidoptera: Gelechiidae) Body is 5 - 7 mm long; yellowish brown.

  15. Fore-wings are pale brown have small black spots • Hind-wings are greyish brown, pointed at the apex and have a long fringe of hairs (> ½ wings width).

  16. Labial palps are long, slender and sharply pointed

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