The Japanese beetle was first found in New Jersey in 1916. The bug had made its way to the United States when plants were imported from Japan. The insect would eventually spread up and down the east coast. Delaware being next to New Jersey constantly monitored the spread of the beetle by having people volunteer to put beetle traps in their yard. The number of them trapped were reported to the state.
In the Journal of the State Senate 1929 they listed the people in Delmar who had trapped beetles and the count.