Let me preface this by saying, I'm new to the PHC game but have been thrown into the deep end. To carry the metaphor, since y'all seem to be the lifeguards on duty, I'm hoping you can keep me from drowning. We did soil injections of Imidacloprid in March to control for HWA. Just returned to the trees after the owner complained about browning. "Browning" being a couple branches have needles that turn yellow, then brown, and finally fall off. Generally, the trees look pretty healthy (see pic 1). The neighbor recently put up a wooden fence less than 2 feet from these trees, but the fence didn't appear to damage any of the roots (yet). After inspecting a number of the affected branches, I found a very small population of needles have some sort of scale(?) (see pics 2-3). Is this browning normal? Might it be related to the Imidacloprid, the scale, or even the fence?