The sycamore lace bug can potentially devastate all plane trees.
It is actually a stink bug that comes to “suck” the sap from the underside of leaves.

Tiny quarter-inch (3mm) bugs feed in clusters on the underside of leaves.

But to protect our planet, there is a method that derives from organic gardening.
Simply pressure-spray the trunks and structural branches of your plane tree with rapeseed oil to dislodge and suffocate the insect pests.
I would like to learn about a treatment against japanese scarabee in my vinegrape, an organic treatment that does not cost too much money and that is naturel.
Lots of thanks to you !
Gisele