I have a problem with the young leaves on my lemon and orange trees curling up, however, before they curl up I can see what looks like a silvery trail on the tops of the leaves. Sort of looks like what a snail might leave behind when it moves across a glass surface. It is a random squiggly trail all over the top of the leaf. At first I did find some mealy bugs on the leaves and black and gray eggs on the underside of the leaves. However, the young leaves are being attacked almost as soon as they bud out. What is my problem?...A nearby nursery has the same problem and they don't know what is going on either.