At the end of last September, after we took down a 75-year-old Silver Maple standing on a 13 foot wide grassy strip (part of the tree had fallen on ther house), I had a 20-foot tricolor beech planted 13 feet away from where the maple stood. We had to grind out a giant root from the old maple in order to make a hole large enough for the beech root ball. The tree is planted on the north side of the house. There is a bit of shade thrown on the tree during the day, but it's primarily in a full-sun location. The beech had no leaves when planted. I watered it faithfully through our pretty warm winter, giving it a long soaking with a soaker hose each time... The beech leafed out about a month ago. The leaves are dark maroon with only a hint of pinkish color, not the green-pink-white I was shown on a smaller tricolor beech in the tree nursery at that time. And now I've noticed a white cotton-candy-like substance on the underside of a small number of leaves. I brought a leaf to the nursery, they tell me it's aphids and that I need to use a systemic insecticide to kill the aphids. I hate dumping insecticides into the ground., Your thoughts please. (I suspect this is not the beech variety I ordered. And no one at this well-regarded tree nursery said anything about avoiding full sun for a tricolor.) Thank you so much for any suggestions you have.