Q.Sycamore tree
Sycamore tree sticky leaves and lots of bugs!
Downtoearthdigs
Answered on May 25, 2018
The sticky substance is Honey Dew, it's the residue from pests.
Do a bit more searching; likely culprits are Aphids, Mealy Bugs or soft Scale.
Treat with Neem Oil.
These links will help you.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/garden-how-to/info/what-is-honeydew.htm
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