Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Fall Fund Drive


Species Rhyzopertha dominica - Lesser Grain Borer

Rhyzopertha dominica (Fab.) - Rhyzopertha dominica black speck - Rhyzopertha dominica Beetle - Rhyzopertha dominica Beetle - Rhyzopertha dominica Beetle - Rhyzopertha dominica Beetle - Rhyzopertha dominica tiny beetle - Rhyzopertha dominica tiny beetle - Rhyzopertha dominica
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
Superfamily Bostrichoidea (Carpet, Powder-post and Death-watch Beetles)
Family Bostrichidae (Horned Powder-post Beetles)
Subfamily Dinoderinae
Genus Rhyzopertha
Species dominica (Lesser Grain Borer)
Explanation of Names
Rhyzopertha dominica (Fabricius 1792)
2-3 mm
native to tropical Asia, now cosmopolitan(1); in our area, reported from across Canada (NS-BC)(2) and throughout the grain-producing areas of the US(3)
mainly confined to heated buildings in the temperate regions(3)
serious pest of both whole kernel stored grain and cereal products
Life Cycle
Larvae develop in whole grain and remain within the kernel through 4-5 instars; on wholemeal there are 2–7 instars(4)
Commonly infests flour, macaroni, beans, chickpeas, seeds, edible bulbs, grains, sometimes wood; damage can be considerable because adults and larvae feed on the surface and interior of grains. Adults readily fly but their flight is not well oriented, and air currents carry them.(4)
Internet References