Hi Madeleine, the following article should answer your question
Don't be deceived by the title, it's all about betulias and how to grow, propagate.
My pet hates are the same as nutcutlet's and sara's, collecting piles of weeds and taking them to the compost bin. OH complains I always leave the heaps right where he has to walk, and looking for tools deposited around the house. He has painted all the handles of mine a bright yellow so that I can see them from a mile away!
"I might even print it off and post it through their door!"
Have followed this thread with interest and found the following which may be of interest:
I agree with above, but judging by the whitish leaves on the rhodo, it looks like it needs a tonic of some sort.
Well, that's a revelation! No wonder mine kept dying when I planted them in my border. Will try again with the right compost! Thanks IDGM and Verdun!
Just posted this to Gail Peacock:
We got rid of ours with glyphosate, double dosage!. First chopped it all down and after that sprayed/filled the hollow stalks and every little leaf that dared to show itself. Took two Spring/Summers but it has definitely disappeared and never came back. Good luck!
What about climbing hortensia?
I can't help wondering if, when you hose the little blighters off, whether they don't just climb back up the nearest plant where they land and continue munching there?