If the edges of the plants are notched like in the photos I’ve found for you to link to below, you probably have some kind of weevil (likely the black vine weevil). Now as to what to do about it…chemical pesticides have always been the protocol, as you will see if you read up on whatever bulletin your state cooperative extension publishes online, which I’m sure they do. I can’t recommend, nor do I use, these chemicals, so I have no first-hand expertise to share, sorry to say. I do, however, have notches in some of my rhododendron leaves, so I feel your pain. Have a look: http://www.entomology.umn.edu/cues/blackvw/blackvb.html
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.