Japanese Beetle

Fascinating facts about the Japanese Beetle

• Adult Japanese beetles measure about 15 mm long and 10 mm wide, giving them a compact, beetle-shaped profile. Their wing covers shine with an iridescent copper hue while the thorax and head are a vivid green, making them instantly recognisable in the field. Males are a little smaller than females, a subtle dimorphism that can be seen when the insects are examined side by side.
• The Japanese beetle first appeared in United States records in 1916 when a nursery near Riverton, New Jersey reported its presence. Entomologists believe the insect arrived earlier, likely hitching a ride in a shipment of iris bulbs that entered the country before 1912, just before systematic inspections of imported commodities began.
• Between late June and 3 September 2021, more than 20 000 Japanese beetles were recorded in Grandview, Washington. This count was reported for that specific summer window.
• An adult female Japanese beetle may lay as many as 40-60 ova over her short lifespan. She deposits each egg singly or in small clusters just above the soil surface, where they are protected from predators. Within roughly two weeks the eggs hatch and the larvae begin feeding on fine roots and organic matter, later becoming C-shaped grubs that can reach about 2.5 cm in length.
• Japanese beetles spend the majority of their life hidden in the soil as larvae, emerging as adults for only 30-45 days each year. During this brief adult stage they feed on leaf material, skeletonising foliage from the top of the plant downward while using pheromones to attract conspecifics.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Japanese Beetle

In the lush gardens and verdant landscapes of eastern Asia, a tiny, iridescent gem flits about, its metallic blue-green elytra glimmering like polished jewels in the sunlight. The Japanese Beetle, with its delicate, lacy wings and agile, dance-like movements, navigates the intricate world of petals and leaves with an effortless elegance, its very presence a whispered promise of life and abundance. As it alights upon a tender shoot or unfurls a delicate flower, its gentle, probing touch belies a voracious appetite, for this diminutive insect is a consummate herbivore, leaving a trail of carefully crafted holes and perforations in its wake.

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