I have two small boxwood hedges in my garden which I have trained over the years by cutting into the form of a cuboid. One hedge is in a shady and wet place, one is fully exposed to the sun, south oriented.
They are two different kind of boxwoods, of which I don't know the species. One, I'd say, is the classical one, round leaf variety, one has slightly triangular leaves. Both show the same symptoms.
Last year, I don't know why, I cut the hedges in October only. Even though I'm aware that it should be done in late/middle-summer. I think I thought, what the heck.
Right after cutting I noticed that the some leaves started getting (or already had been gotten) dry and became white-greyish. I thought, ok it was too late, but it won't kill them, they will recover.
At the same time people in the village reported a box-infection of some kind of insect (I forget the name).
Then winter came, we had colds going down to -5 °C and I thought if it is insects, they are dead now.
Now in spring I'm fearing the worst, 50% of the hedges show grey leaves, there is barely new growth.
Today I noticed that there some kind of webs inside (might be normal) and some crumbs, which could be sediments of something, or simply birch pollen. (There are birches nearby).
Here are some pictures I took. I'd like to know what it is and if there is anything I can to do prevent further damage.