https://hnr.k-state.edu/extension/info-center/common-pest-problems/common-pest-problem-new/Japanese%20Beetles.pdf
https://extension.colostate.edu/topic-areas/insects/japanese-beetle-5-601/
http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/insects/beetles/japanese-beetle.aspx