I recently received a Northern Hi-Lights Rhododendron from a well respected mail order site and after returning from a long weekend getaway I've found neat round holes all over the leaves. It really does look like a hole puncher was taken to my plant (see pics below).
I have another rhodi that has been completely healthy and pest free for the 2 years I've owned it. I've moved the infected plant away from the clean plant.

Can someone please tell me what this pest is and how best to treat it. My current theory is that it's Black Vine Weevil and I'm thinking of purchasing some nematodes. But I'd really like to be sure about it before I try any treatments.

http://www.flickr.com/photos/jpecot/sets/72157605589958402/

Thanks in advance for your help!

I have not seen the bees at work, but now that I know what to look for I am very interested to see them cut these perfect little circles.

So, besides messing up my foliage, they aren't harmful to my plant, are they?

Do you know how long their mating season lasts (ie when they'll stop eating my leaves)?

Thanks again! I feel very relieved now!

I have never seen leaf cutter damage on a rhododendron before. May I use your photo on my website below?