In Raleigh we have reached 900 degree days. This is around the time when Japanese maple scale drawer abundance will be peaking. At least for the first generation. Unfortunately the crawlers have been emerging for a couple weeks and will continue for a couple more. Thus, trying to target all the crawlers with a single insecticide application is tough. However, some help can be provided with systemic neonicotinoids such as dinotefuran and translaminar insect growth regulators such as pyriproxifen. Good publications from University of Maryland and University of Tennessee have nice pictures and diagnostic characters. This has been an increasingly important pest so it is worth looking out for.