Magnolia sunrise - black petals 😢

Hi, my magnolia sunrise has black petals - do you know why this is?
It's getting very tall - should I prune it back? If so, when is best to do this?
Thanks in advance
Ps I did notice some foam from a spittlebug - not sure how much of an issue this is?!
It's getting very tall - should I prune it back? If so, when is best to do this?
Thanks in advance
Ps I did notice some foam from a spittlebug - not sure how much of an issue this is?!
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