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The lesser grain borer

The lesser grain borer
The lesser grain borer
Lesser grain borer larva
Fig. 5.41. Lesser grain borer with larva that lives inside the kernel.

Latin: Rhyzopertha dominica.

2 – 3 mm long, reddish-brown to black-brown beetle. The prothorax is large and rounded in front like a hood, which on the top and in the front is covered with small lumps. The lumps help when the beetle drills. Head with mouth parts is on the underside of the prothorax and is not seen from the back. Feelers are 10-jointed and the three outer joints form a thick-toothed comb.

In the tropics, it is a dreaded pest of wheat, corn, rice, millet, etc. It is quite rare in Northern Europe, but is sometimes found in imported goods. In order to develop and reproduce it requires temperatures greater than 21 ° C. It is therefore only harmful in very warm stocks. Both larvae as well as beetles bore irregular perforations in kernels. Heavily infested items become dusty from the insect drilling and have a distinctive, strong honey smell. Extermination can be done by cooling the products or by using poison gas.

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Henri Mourier
Biologist at Statens Skadedyrslaboratorium
Author of:
"Pests in House and Home"
"Bed Bugs - Bites, Stings and Itches"
"Food Pests"
"Husets dyreliv" (Insects Around the House - Only danish)
"Skadedyr i træ" (Timber Pests - Only danish)
"Stuefluen" (Common Housefly - Only danish)
Latest posts by Henri Mourier (see all)
    Food Pests
    Introduction
    An old problem
    Competition for food
    Pests can ruin stored goods
    Why not just eat the insects
    Some insects are unhealthy to eat
    Allergy to pests
    Transmission of infectious diseases
    Where do pests come from?
    Synanthrope species
    (1) The house dust mite and the sugar mite
    (2) The firebrat and the silverfish
    (3) The German cockroach and the forest cockroach
    (4) The rust-red flour beetle and the confused flour beetle
    (5) The merchant grain beetle and the saw-toothed grain beetle
    (6) The cigarette beetle and the drugstore beetle
    (7) The rice weevil and the granary weevil
    (8) The pharaoh ant and the common black ant
    History of the dark flour beetle
    Pests in bird’s nests
    Mould fauna
    The Look and Behaviour of pests
    Insect appearance
    Internal
    Insect development
    Insect senses
    Behaviour
    Water and Moisture
    Temperature
    What insects live off and live in
    The Air
    Mites
    Bug Indentification
    The various species
    Mites
    The flour mite
    The sugar mite
    The common house mite
    The Lardoglyphus zacheri
    The prune mite
    The cheese mite
    The house dust mite
    The Cheyletus eruditus
    Silverfish
    The Silverfish
    The firebrat
    Cockroaches
    The German cockroach
    The Oriental cockroach
    The brown-banded cockroach
    The American cockroach
    The extermination of cockroaches
    Crickets
    Earwigs
    Booklice
    Butterflies
    The Mediterranean flour moth
    The warehouse moth
    Tropical warehouse moth
    The brown house moth
    The Indian meal moth
    Grain beetles
    The saw-toothed grain beetle
    The merchant grain beetle
    The rust-red grain beetle
    Flour beetles
    The yellow mealworm beetle
    The lesser mealworm beetle
    The dark flour beetle
    The confused flour beetle
    The rust-red flour beetle
    The bolting cloth beetle
    Furniture beetles
    The drugstore beetle
    The cigarette beetle
    Bostrychidae
    The lesser grain borer
    True weevils snout beetles
    The granary weevil
    The rice weevil
    The corn weevil
    Bean weevils
    The common bean weevil
    The coffee bean weevil
    Skin beetles
    The bacon beetle
    The dermestid beetle
    The leather beetle
    The khapra beetle
    The reesa vespulae
    Chequered beetles
    The red-legged ham beetle
    The red-breasted copra beetle
    The black-legged ham beetle
    Spider beetles
    The Australian spider beetle
    The white-marked spider beetle
    The golden spider beetle
    The smooth spider beetle
    Plaster beetles
    Flies
    The common house fly
    The lesser house fly
    Blowflies
    The grey flesh fly
    The cheese skipper
    Fruit flies
    Hymenoptera
    The common black ant
    The pharaoh ant
    Wasps
    Birds
    The domestic pigeon
    The house sparrow
    Prevention and control of birds
    Rodents
    The house mouse
    The yellow-necked mouse
    Mouse prevention
    Mouse control
    The brown rat
    The black rat
    Rat prevention
    Rat control
    Imaginary pests
    Niches of food pests
    A: The Waste Niche
    B: The seed niche
    C: The dead plant niche
    D: The sugary excrement niche
    E: The carrion niche
    Prevention and Control, Integrated Control
    A. Inspection of the company and its environment
    The environment
    The premises
    Examination of raw materials and food on site
    Sampling
    Laboratory methods for detection of pests in food
    B. Statement of the problem
    C. Prevention and control
    1. Proper organisation of the company
    2. Proper operation
    3. Exclusion, proofing buildings
    4. Packaging
    5. Non-chemical control measures
    6. Chemical control
    D: Effective monitoring and communication
    Practical information
    Index

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