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steveduncanmusic

Urban growers - anyone know what this could be?

I'm noticing what looks like small droplets of black oil on leaves throughout my backyard. What could this be from? It is wet to the touch and smears on contact.

On goji leaves:

On serviceberry leaves:

On gooseberry leaves:

On spurge:


Across the back alley there is a church with a large a/c unit on the roof - could it be throwing off oil spray? Once in a while the city sprays for mosquitoes, could that be it? It seems to be everywhere in my yard. Or is there some disease I'm unaware of that attacks all these varieties? My yard is about 30 feet by 30 feet and is in a dense urban area of Chicago.

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