Strange web like a cocoon taking over hawthorn

Question

The leaves inside Web have gone browntree and bubbly can’t see spiders

Answer 1

Without photos, there are two possibilities that I can think of: webworms, or giant whitefly.

Fall webworms have a defined but loose web with caterpillars inside.
without photos
Giant whitefly has masses of white filaments, something like webbing and there will be small white flying insects fluttering about.