What are these clusters of black bulbs on my Cherry Tree?

Can anyone tell me what these clusters of black bulbs are on my Cherry Tree? They can be easily picked off and crushed if you step in them. They appear to be filled with some kind of greenish puss and some pinkish grainy and soft substance. 

Ants seem to like crawling on them. And the tree leafs generally appear droopy. 

What are these clusters of black bulbs on my Cherry Tree?

 

What are these clusters of black bulbs on my Cherry Tree?

 

Newbie Asked on May 4, 2020 in Trees.
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