Q.Magnolia tree
Cause of heavy sap ?

Downtoearthdigs
Answered on June 29, 2017
Did the tree suffer an injury? Is the sap dripping from wounds in the tree?
Insects can leave a sticky residue called Honeydew.
These links have more information.
https://extension.psu.edu/pests/plant-diseases/all-fact-sheets/wetwood-or-slime-flux
https://www.gardeningknowhow.com/plant-problems/pests/insects/aphids-tree-disease.htm
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