Flowering dogwood disease

[Nybonsai12]

Looking for help. Not a bonsai, landscape tree at my parents house that they are upset about. What is this? I couldn’t find anything that looked exactly like this while searching. It looks like a combo of the black spots like in the pic and what appears like powdery mildew in some other spots.

Very wet past 6 weeks. It’s next to an azalea with leaf gall also which I didn’t think there was treatment for other than picking off infected leaves before they turn white, which theirs already have. It’s a mess!

Any help is appreciated.

 

[Jzack605]

Definitely some powdery mildew in second pic and maybe leaf blight in first, look for grey mold if wet conditions continue. You're in NY? We've had a relatively wet spring and funky fluctuating temperatures; both issues in images are a result of wet conditions. Mildew you can apply with a fungicide as soon as symptoms occur and blight may get corrected with dry and warmer weather, fungicide should help as well. Definitely some pest pressure showing in second image, most likely as a result of the tree being stressed due to fungal pressure. Would recommend a local arborist or plant healthcare specialist to do a fungal spray and follow up insecticidal spray and/or combo spray of both treatments. Many times pests will capitalize on diseased tree, correct symptoms and pest pressure is manageable naturally. At the very least when fall clean up comes along remove leaves and destroy to prevent fungal spores from overwintering in soil and fertilize following spring. It's pretty early for these diseases to show so treating sooner is better.

 

[Nybonsai12]

Thanks for the info @Jzack605

 

[rodeolthr]

In the PNW, cornus florida and cornus nutallii (our native here) are routinely defoliated by anthracnose. They all seem to survive, but the are plenty of instances where mature trees have become stressed from many years of infection and finally succumb. Cornus kousa does not have that problem, hence its place in the nursery trade.