Maladera castanea, Asiatic garden beetles

breakfast buffet for crows
The Asiatic Garden Beetles are back, feeding at night on tender oak leaves. The AGBs are attracted to electric light. Don’t swim well. So this tupperware pool, lit from below, attracts about twenty-five beetles per night. The beetles tread water until just after dawn when the crows come and enjoy crunchy breakfast buffet.

A native of Japan and China, where it is not an important pest, the
Asiatic garden beetle (Maladera castanea) was first discovered in
the United States in New Jersey in 1922. Asiatic garden beetle grubs
feed off the roots of grasses and weeds in early spring. Adult beetles
attack many different vegetable, herb, fruit, and ornamental plants,
feeding mostly at night where they strip, shred, and notch the foliage
of their hosts. Asiatic garden beetle damage is especially prevalent
around the leaf margins.–University of New Hampshire