Answer: Based on your description I think you are probably seeing a scale insect infestation. It is important to get a specific identification and control recommendations based on knowing exactly what it is rather than guessing. But scale can spread and can be difficult to control so do not wait. I would strongly suggest you work with your local county extension for a definite identification and then based on that, their control recommendations. If a chemical control is needed they will be able to tell you what to use and how/when is best to apply it for maximum results. Good luck!
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