Doubt 'Eddie's White Wonder' suitable for your conditions. Other hybrids have varying pest and disease tolerances. Kousa might be best choice.

Here is a link that might be useful: NCSU Search Results - Cornus - Index

Small trees are not my forte but cornus kousa is routinely recommended over cornus florida down south for pest/disease resistance.

Thanks.

I was hoping to get some Cornus nutallii genes into zone appropriate trees for me.

PlantMarker

Follow UCSU link to discussion of hybrids, then from there to table of each giving pest and disease parameters.

3) A C. nutalli x C. kousa cultivar. ('Venus'?)

Very disease resistant, and rather expensive still. They are impressive though. Have seen some small graphs showing up as of late. You may consider starting small. They are said to grow vigorously.

For straight kousa, there are many good choices. Milky Way and Heartthrob being a personal favorites.

Arktrees

Here is a link that might be useful: Kousa Dogwoods