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LANDSCAPING | GARDENING | PROBLEM SOLVING

Asiatic Garden Beetle

Asiatic Garden Beetle

The Asiatic garden beetle (Maladera castaneawas) introduced from Japan in the 1920s. It is most commonly found in northeastern states from New England to Ohio and as far south as South Carolina. The species is commonly confused with native species of Anomaline scarabs.

Adults are a chestnut-brown, nearly ½" long and resemble the Japanese beetle in size and shape. They lay their eggs in the soil at the base of the plants, where the newly hatched grubs eat their roots. Control these beetles the same way you deal with Japanese beetles. They are less likely to congregate in the numbers that Japanese beetles do.

The Asiatic garden beetle has 4 life stages: egg, larva, pupa, and adult. There is one generation per year. The eggs are laid in the soil in clusters of up to 20, held together by a gelatinous material. The larva, or grub, is a typical C-shaped scarab grub.

The larvae pupate in late June, with adults flying in July and August. The adults are highly attracted to light and may be very numerous at windows, doors, or wherever there is a bright light. The females burrow into the soil to lay their eggs (50+). Eggs hatch in about 2 weeks and the larvae begin feeding.

The larvae (grubs) occasionally attack turf, but seems to prefer soils with a variety of roots from weeds, flowers and vegetables. Adults feed on more than 100 species of plants, with a preference for the flower petals of asters, dahlias, mums, roses as well as the leaves of a variety of trees and vegetables.