I started growing upright fuchsias about 3 years ago, after giving up on hanging ones (due to gall mite) about 5 years before. I had no fuchsia mite issues for the first year, had problems with one plant the second & rampant problems the third (this) year. My nettala has escaped the mite, thus far, and wonder if it's due to proximity - ie. the other fuchsias are near each other, the nettala is 25 - 30 feet away. I've used Bayer 3in1 (the only place I use this in my garden), & it worked for a while, but doesn't seem to help any more by the end of the summer.
I love the fuchsias & was propagating them, but am about ready to give up on having more than one or two.