The answer is very likely to be nothing! The chances are it’s a bad case of Shot hole. This fungal disease attacks the leaves which leave small irregular pale brown patches that will eventually fall out, giving the appearance similar to that of a rather large slug or caterpillar that has had a midnight feast on your laurel leaves! This disease is particularly prevalent after long periods of rain as the spores are easily dispersed by rain.
- Shot hole usually affects young leaves so your plant should start to recover once the drier weather comes along.
- Keep the surrounding area free from debris.
- Spray with a fungicide. This will help with powdery mildew.
- Prune out any dead branches or twigs.
- Try not to water overhead.