Download - Rice weevil
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K.H.P. RathnaweeraA. M. S. L. AtapattuK. M. JayasinghaP. K. P. N. Shyamalee
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Introduction
• Kingdom: Animalia• Phylum : Arthropoda• Class: Insecta• Order: Coleoptera• Family: Curculionidae• Genus: Sitophilus• Species: S. oryzaeBinominal name:Sitophilus oryzae
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Habitat
• Rice weevils are usually found in, Grain storage facilitiesFood processing plantsFood markets
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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
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Larvae;• Legless, humpbacked• White to creamy white in colour• Has a small tan head
Pupa;• White in colour• Appendages free • Segments are movable
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Life cycle
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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.
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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.
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Damaged foods
• Rice• Wheat• Corn• Macaroni• Oats
• Barley• Sorghum• Kaffir seed• Buckwheat• Rye
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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.
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• 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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