Japanese beetle

Definition

A small scarab beetle, Popillia japonica, native to Japan and invasive in North America, Europe, and other regions; adults feed on foliage, flowers, and fruit of over 300 plant species, while larvae (white grubs) consume roots of turf and pasture grasses.

Etymology

From Japan (native range) + beetle; scientific name Popillia japonica uses Latin japonica 'of Japan'.

Example

Japanese beetle traps baited with floral lures and sex pheromones often attract more beetles than they capture, potentially worsening infestations in adjacent rose or grape plantings.

Synonyms

• Popillia japonica

Related Terms

• scarab beetle
• white grub
• Invasive species
• Integrated Pest Management
• pheromone trap
• defoliation

Usage Notes

In North American horticulture and turf management, 'Japanese beetle' refers specifically to Popillia japonica, though several related Popillia species occur in Asia. The species is not considered a major pest in its native Japan due to natural enemies including parasitoid wasps (Tiphia vernalis, Istocheta buonanni) and bacterial pathogens. Adults skeletonize leaves by feeding on tissue between veins; this feeding pattern distinguishes them from many other leaf-feeding scarabs. Regulatory quarantines and soil treatments for grubs are common management approaches in invaded regions.