Oh dear. If you see white webs it could be the leafroller caterpillar that ties together leaves then feeds by skelentonizing the leaf. This insect overwinters on bare branches and stems then hides in the soil in the summer. The good news is that population usually declines on its own once the numerous parasites of the leafroller figures out where they are. You can also treat the shrubs with Bacillus thuringiensis or Bt a natural bacteria insecticide. A dormant oil spray in the winter can kill many overwintering eggs. Don't give up and keep picking off the infected leaves. Hydrangeas are pretty tough shrubs and your will most likely survive the outbreak. Keep growing, Marianne Binetti