Ask a Question forum: What's this thing on this conifer?

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Europe (Zone 7a)
Region: Europe
May 8, 2017 11:48 AM CST
Something quite disgusting appeared on the junipers. Looks like this. There was much more of that, the most affected parts were cut, but it's still there.

What is it, where did it come from, and what best to do about it?

Also, can it spread to nearby plants?

Thumb of 2017-05-08/3mark/112169

Thumb of 2017-05-08/3mark/f2e5db

Thumb of 2017-05-08/3mark/c955c2

Sorry about the low quality photos, that's the best the phone can do in cloudy weather.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
May 8, 2017 12:12 PM CST
What comes to my mind is a rust disease, check out these pictures of rust on Juniper (also affects pears) caused by Gymnosporangium sabinae in Europe:

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