This handsome invasive beetle came to America over a century ago, most likely in the root ball of an imported plant. It has spread across most of the US and primarily terrorizes non-native plants and ornamentals. It hatches from grubs in mid-June, then feeds voraciously on flowers and leaves through August, skeletonizing leaves all the way to the veins. They love roses.
Some people try to control this insect with pheromone traps, but this just attracts more beetles, all of which are impossible to eradicate. Best to carry a cup of soapy water to your garden in the early morning when beetles are sluggish and brush them into the cup. Since they fall easily to the ground when disturbed, be sure to hold that cup to catch them as they fall. If you go out to the garden too late, some of the beetles will fly away when disturbed. You can also find them sluggish in the early evening, but then they've fed on your plants all day!
Some native insects, such as the blue-winged wasp, have become a natural predator of the Japanese Beetle. You can help by planting native plants to avoid contributing to the propagation of invasive species! Hopefully, Nature and conscious humans will prevail in controlling this pest insect.