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Dear Neil, regarding the crape myrtle bark scale – Southeastern Virginia has been battling this pest for years. The scale itself will not kill the plants. However, the sooty mold is the real problem. The more insects, the sootier mold there is. The mold covers the leaves, which reduces photosynthesis. It also covers the thin bark, resulting in poor respiration. After several years of uncontrolled pests, the plant will die. I’ve seen even plants with 8-in. diameter trunks require removal after three to five years. Foliar applications of dormant oil do not work. Contact sprays offer very limited control. Systemic insecticides do the job. After two years, the pests are gone, and the sooty bark has sloughed off. In my opinion, this is not a pest to ignore.