Tartarian Maple: resistant to Japanese Beetles
Looking for deciduous tree, exposed, 15 feet from corner of house, that is hardy, good for Denver climate, and most of all, resistant to Japanese Beetles. Wondering is Tartarian Maple is resistant to these. Have a Pink Flair Flowering Cherry planted in Spring because Japanese Beetles have destroyed it.....possibly Pear, possibly Redbud, possibly Magnolia? Need suggestions for Japanese Beetle resistant trees that are not large but will live a while. Thank you.
Denver County Colorado trees and shrubs
No list of deciduous small trees suitable for Colorado that Japanese Beetles avoid exists that I'm aware of but here is one from the University of Kentucky: https://entomology.ca.uky.edu/ef451. Anecdotal reports in Denver have Japanese Beetles favoring Linden, Prunus (like cherries and plums), Rose of Sharon and Japanese Maple; I have not heard of Tartarian Maples being eaten.
Redbud and Magnolia make Kentucky's list for being less likely to be eaten, but they may not be the best choices for an exposed site in Denver. Magnolias, while root-hardy, may not be bud-hardy: the flower buds form the summer and fall of the previous year so they must make it through the winter to bloom. Even when they do, they bloom early and often get frozen. Both Redbud and Magnolia might be better in a protected site.
You also might consider Hawthorn or Japanese Tree Lilac for an exposed site.
Here's a link to a list from CSU Extension of Small Deciduous Trees that might help narrow the possibilities: http://extension.colostate.edu/topic-areas/yard-garden/small-deciduous-trees-7-418/