Little Black "Eggs"?

I purchased a new greenhouse last autumn and used it to overwinter my small peach and apricot trees. They flowered and were hand pollinated in February and a few small fruits are setting. Now the leaves are covered with black spots, probably eggs as they are not moving. They brush off easily but there are masses of them and 7 trees. One small peach tree got left outside by mistake over winter and is unaffected. Its flowering now. Hoping it doesn't get peach curl. The leaf picture is not good but its just black dots. Would appreciate any idea as to what this is, how to get rid of it and how to prevent it. Sorry for the greedy post. Earlier posts are several years earlier (2011 & 2013) and I'm not sure if I have the same thing. Thanks.

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