Magnolia tree not well

Question

Some edges of leaves are turning brown. New leaves do not look healthy and are a bit shrivelled and brown. About a week ago it was attacked by what I think were aphids.

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Answer 1

These articles should help:

https://www.gardeningknowhow.com/ornamental/trees/magnolia/magnolia-tree-diseases.htm

https://www.gardeningknowhow.com/ornamental/trees/magnolia/yellow-magnolia-leaves.htm

http://ipm.ucanr.edu/PMG/GARDEN/PLANTS/magnolia.html