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.
Largest Beetles: Hermit Flower Beetle, Japanese 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.