Synonyms and other taxonomic changes
Anomala orientalis (Waterhouse, 1875)
Phyllopertha orientalis Waterhouse 1875:108
Blitopertha orientalis (Waterhouse), authors
Exomala orientalis (Waterhouse), Baraud 1991, Piattella and Sabatinelli 1994
Elytra each with 6 deeply grooved striae between humeral umbone (swollen area - striae don't continue over top of swelling) and suture (midline); intervals (area between striae) subequal (almost equal), subsutural (adjacent to suture) interval not much broader or multipunctate; variously marked but often with dark fasciate spots or bands - rarely all black. Pronotum immaculate to black, with or without paired maculae (darkened region).
Introduced from Asia. Asia, Hawaii, eastern coast of the United States from Maine to South Carolina and Wisconsin. Still spreading in the U.S. It arrived in the United States in the 1920s.
larvae are found in the soil under lawns
adults are occasionally found on flowers such as rose and hollyhock blossoms
adults emerge in late June and July
larvae feed on grass roots just beneath the surface of the ground
adults feed very little
In mid-summer, eggs are laid in the soil, up to a depth of about 6 inches. These eggs hatch 3 to 4 weeks later and the young grubs ascend and feed on the grass roots near the surface. In late October and November, they descend 12 inches to overwinter. In April, they resurface and resume feeding until the first of June when they go down to a depth of about 6 inches to pupate. They pass through a prepupal period of about 6 days, then pupate, and 2 weeks later the adults emerge. There is one generation each year, although a few individuals do not transform with the others, therefore requiring 2 years for their development. [from Govt. of Connecticut site; see below]
Often considered Exomala sp.
common name reference; PDF doc
[Asiatic Beetle] (Turfgrass Information File, Michigan State U.)
Discovery in Indiana via Purdue Entomology