Beetles in Iowa

Among the several beetles found in Iowa, the Japanese beetle has been a complete nuance mainly inhabiting the central part particularly in spring. Its close cousin the false Japanese beetle is also a native of Iowa but are not harmful pests like the latter.

When it comes to the larger beetle species thriving here, the hermit flower beetle is one of the significant ones. Mostly found from July to August, this one inch-long beetle is rendered harmless particularly in their adult stage. Of the smaller species, the carpet beetles and foreign grain beetle emerge as prominent house pests. On the other hand, the blister beetle species occurring here in summer inhabit alfalfa and soybean fields, causing more harm to the livestock ingesting the crops than the crops itself.

Beetles in Iowa (IA)

Largest Beetles: Hermit Flower Beetle, Japanese Beetle

Smallest Beetles: Black Carpet Beetle, Varied Carpet Beetle,Foreign Grain Beetle

Most Common Beetles: Japanese Beetle, False Japanese Beetle

Here is the list of beetles found in Iowa arranged in order of the family they belong to.

Ladybird Beetles

Skin Beetles

  • Black Carpet Beetle (Attagenus unicolor)
  • Varied Carpet Beetle (Anthrenus verbasci)

Darkling Beetles

Silvan Flat Bark Beetles

  • Foreign Grain Beetle (Ahasverus advena)

Scarab Beetles

  • Japanese Beetle (Popillia japonica)
  • False Japanese Beetle (Strigoderma arbicola)
  • Hermit Flower Beetle (Osmoderma eremicola)

Long-toed Water Beetles

  • Helichus basalis
  • Helichus fastigiatus

Stag Beetles

  • Pleasing Stag Beetle (Lucanus placidus)

Blister Beetles