Black spot in Zone 5

Black spot in Zone 5

'morning! ^_^ I think some of the hollies (ilex x meserveae, "Blue Prince & Blue Princess") I planted last fall are developing black spot. Aagh! I sprayed them with an anti-desiccant before winter, and wonder if that may have been a contributing factor? In any case, I was hoping for suggestions as how to treat them? Should I spray them with a fungicide? And which one should I use? Thanks!
A kitchen garden – at last!

A kitchen garden – at last!

Help! stunned baby blackbird

Help! stunned baby blackbird

By golly!

By golly!

Back to the community garden

Back to the community garden

From my garden and terrace…

From my garden and terrace…

Flowers

Flowers