This Deutzia is probably about 4-5 years old and did exceptionally well last year. This year, however, after a late winter, it started off well, but now is developing a lot of white leaves alongside full green ones, Just quite odd to me. It's sited facing West in a yard and gets full sun from 12 - 4 pm. I usually would move it to a shadier spot purely to allow me to watch the bees but as yet they've not appeared so I've left it where it is.

It's been fed with "Richard Jackson's Flower Power" (UK) fortnightly and had the soil top dressed just before the buds appeared.

It's been "bug" sprayed with a quality spray but we've got an aphid explosion currently so I'm doing a lot of manual clearing as well.

Any ideas?