Answer: Yes, if a number of different plants are being affected in one area, it is possibly due to a pest or disease problem but I think it is more likely something environmental such as a change in drainage making it suddenly extra wet or extra dry, accidental chemical exposure such as salt spray from a road or weed and feed from a rotary spreader, or something unusual like an underground gas leak. You may have to do some detective work to figure out the cause. Your local county extension and/or certified nurseryman should be able to help you trouble shoot. They will be able to help you diagnose pest and disease problems (they may need samples and/or some photos) and suggest how to proceed based on the diagnosis. Good luck with your mystery!
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