Answer: Unfortunately, based on your description I am not certain what is affecting your shrubs. Leaf miner insects will make tiny squiggly white lines inside foliage. Spider mites can make a white speckling, they will also leave very fine webbing on the undersides of the leaves. On some plants,such as azaleas, lace bugs can make a white patterning on the foliage. I would suggest you consult with your local Cornell county extension to identify the pest and based on knowing that, decide how to control it. If a chemical control is needed, they will have the most up to date information on what to use and how/when is best to use it for maximum results. To diagnose the problem, they will need to know what kind of shrub it is. They may also appreciate a photo of the overall plant to see the pattern of the damage as well as a closeup of the affected foliage, or a few representative sample leaves enclosed in a clear plastic bag and kept cool so they stay fresh. Good luck with your shrubs!
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