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Stored Product Pests and Their Control

Stored Product Pests and Their Control. Dr. Richard M. Houseman Department of Entomology University of Missouri. Stored Product Pests. Two main orders Order Coleoptera Beetles 300,000 species world-wide 40,000 species in U.S. Order Lepidoptera Butterflies 112,000 species world-wide

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Stored Product Pests and Their Control

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  1. Stored Product Pests and Their Control Dr. Richard M. Houseman Department of Entomology University of Missouri

  2. Stored Product Pests • Two main orders • Order Coleoptera • Beetles • 300,000 species world-wide • 40,000 species in U.S. • Order Lepidoptera • Butterflies • 112,000 species world-wide • 11,000 species in U.S. • Damage is done mostly by the immature stages.

  3. Missouri Stored Product Pests • 12 Important Pests • 10 beetles • 2 moths • Can be divided into two main feeding groups • Pests of whole grains • Consume the grain embryos (protein) • Pests of processed grains

  4. Whole Grains • Rice weevil (Sitophilus oryzae) • Granary weevil (Sitophilus granarius) • More common in granaries and mills • Pierce grains with beak and lay eggs inside • Many cereal grains and seeds infested • Several are found in storerooms, pantries, garages

  5. Whole Grains • Lesser grain borer (Rhyzopertha dominica) • Infests grains in storage or in transport • Strong jaws to open grain and then lay eggs • Rarely a problem in homes or stores • Unless materials arrive infested

  6. Whole Grains • Cowpea weevil (Callosobruchus maculatus) • Not true weevils • No snout • Only infest legumes • Peas, cowpeas, beans • Lay eggs on outside of seeds and the larvae penetrate

  7. Whole Grains • Angoumois grain moth (Sitotroga cerealella) • Mostly a problem in grain storage • Less common in homes • Commonly found in whole kernel corn • Will fly inside buildings Dr. RM Houseman

  8. Processed Grains • Sawtoothed grain beetle (Oryzaephilus surinamensis) • Six teeth along edges of pronotum • Eggs deposited into foodstuffs • Larvae look like lumps and stay in foodstuff • Adults will wander around

  9. Processed Grains • Warehouse beetle (Trogoderma spp.) • Infest grain-based products • Cereal • Spices • Rodent baits • Dog food • Found in warehouses, storage rooms, homes

  10. Processed Grains • Cigarette beetle (Lasioderma serricorne) • Covered with tiny hairs that give it a sheen • Very small larvae • Difficult to locate • Covered with product • Infest many things • Spices, pet food, prescription drugs, tobacco, cosmetics,

  11. Processed Grains • Drugstore beetle (Stegobium paniceum) • Similar to cigarette beetle • Dull, dark appearance • Infest many things • Spices, pet food, prescription drugs, tobacco, cosmetics,

  12. Processed Grains • Confused flour beetle (Tribolium confusum) • Red flour beetle (Tribolium castaneum) • Dry milled, cereal products • Flour mills, retail stores, homes • Nearly impossible to avoid this pest in mills • Flour, cornmeal, cake mixes may harbor them

  13. Processed Grains • Indianmeal moth (Plodia interpunctella) • Most common pantry pest in Missouri • Storage areas, stores, homes • Life cycle of 2 months • Larvae spin silk • Can cover the product • Will leave product and wander for distances • May even hang from ceilings

  14. Stored Product Pest Control • Four basic steps • Locate infested product • Discard infested products • Cheaper to replace it than to freeze/heat/treat • Clean infested area thoroughly • Prevent new infestations • Thick plastic, metal, air-tight containers

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