Laurel bush brown spots
This looks like a combination of very common leaf spot diseases and winter damage on laurel.
Here is our page on it: https://extension.umd.edu/hgic/fungal-leaf-spots-shrubs
Thank you. If I don't get all the infected leaves off, will the fungus spread back again? Should I spray with fungicide? If so, when?
No, we don't recommend fungicides for this.
Don't worry if you don't get all the leaves. The new growth will flush out and if and when diseased leaves fall, pick them up.
As with any diseases, the goal is to try to get good air flow around the plants and as much as possible, keep the leaves dry, meaning, don't water from overhead, keep the mulch away from the stems, with mulch no more than 2-3 inches thick.
Once the new growth begins, on a dry day, prune out any dead branches.
It is a common problem, and probably will continue at times, dependent on the weather. Not too worrisome though.