These bugs seem to be destroying the leaves on my apple trees, which are more decorative at this time in an espalier. I just found them this evening after seeing the spots for a couple of weeks. I learned from here that I have to look under the leaves at times, and luckily while doing that I found these white bugs on this stem. Any help on what I should use to kill lthem - if that is the appropriate course. I don't recall seeing these spots last year.
These might be woolly apple aphids, Eriosoma lanigerum - see http://www.ipm.ucdavis.edu/PMG/GARDEN/IMAGES/INVERT/woolappleaph.jpg for an image and http://www.ipm.ucdavis.edu/PMG/r4301711.html for control guidelines.
