Repotted as a rescue 2 years ago. 100% pumice. Maybe I should quit the goldfish water. The OTHER trees love it.Gonna need a bit more info. Doubt very much this is boxwood blight. sun exposure? soil? watering habits? fertilization? repotted when?
I wouldn't leap to boxwood blight with a few discolored leaves. They look like that when they're a bit sunburned. Your a bit hot and dry for boxwood to be happy, so shade is good. Cut em off and see if anything else happens.
Full sun in straight pumice probably has something to do with it. I've had boxwoods for 30 years as bonsai. Never had an issue and I am in boxwood blight central. Va. Tech Boxwood Blight task force indicates summer high temps in Va. actually slow infection. Cool wet temps in spring and fall spread it.
Boxwood Blight Task Force
ext.vt.edu
How much sun do you give your boxwood bonsai?
Morning sun til appx. 11-noon Then the shade comes over it for the rest of the day.How much sun do you give your boxwood bonsai?
My boxwood gets full sun.How much sun do you give your boxwood bonsai?
Mine get full sun until about noon in the summer. Mostly full sun all winter when they're mulched into storage.How much sun do you give your boxwood bonsai?