Q.get rid of sap from crepe myrtle tree
How to get rid of sap from crepe myrtle?

Downtoearthdigs
Answered on August 3, 2016
This is likely not sap coming from your tree, but Honeydew. Honeydew is the secretions of pests, the most likely suspect is Aphids.
These links have more information.
https://www.gardeningknowhow.com/garden-how-to/info/what-is-honeydew.htm
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-tree-problems.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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