I have a green acer tree which looks like a pale green sycamore and it is covered in flies. It is an infestation and I’m not sure

Question

how to treat it. The flies are on the tree continuosly. There are also some wasps.

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Answer 1

The flies and wasps are the result of another problem, such as aphids or mites or beetles. Here's an article that will help: https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-problems.htm

You may want to contact a certified arborist or a local extension agent for help with bringing this tree back to health.