I'm really sorry I only just saw this thread and could have warned you from the start: having grown hops in the past and been moderately successful - apart from mildew which stopped me after about 4 years (I was growing them in an urban garden). Hops have a huge, really fine, root system; they need to be planted out in the garden in deep rich soil. Growing against a wall is a recipe for disaster because of exactly what you have found - spider-mites. This is usually because of hot dry conditions. If you have another go, get them into some deep soil, loads of FYM (cow sh 1 t) and grow them against a wire trellis - you can do horizontal hops, they don't have to be vertical, but you will be tying them up every day and you should only grow 4 and at the most 6 of the strongest bines and take two or three off in each direction, keep them under control, because they will happily grow to 20 feet in length, so you need a 40 foot fence. Hops need loads of water and they need air around them - another reason against growing them near a wall. I should also warn, hops are subject to quite a few natural erm ... afflictions, wilt, powdery mildew, downy mildew, etc. and once that happens it can devastate an entire area and ruin commercial crops over several square miles. Having plenty of air around your growing bines will help to reduce a lot of the problems and good rich soil will get 'em growing like a foot a day and will also help to produce healthy plants. If you can, double-dig a square about 3 feet by 3 feet, two feet deep and in the bottom dig in a load of well rotted manure - FYM, then fill the soil back in and plant the hop. Once you have a hop established it will grow year on year and give a lovely crop of cones each year. I know of one bine (Fuggles) which grows wild in a hedgerow and each year I get a few good hands-full. Good luck for next year. J.