I have a bunch of raspberry plants, some are reds and some are goldens. One of the golden raspberry plants has multiple canes that have die back. Other canes are healthy and still producing raspberries. Any ideas whats going on?
Check up and down the main canes asked about and see if there is evidence of boring or girdling insects. There may be tiny holes, swelling, or a dark spiral line.
Most likely it’s just a normal life cycle where last years growth is dying back to make room for next years producing canes. Mine died back early this year about a month ago due to drought, so 8 pruned off all the older ones that produced this season and watered aggressive for several weeks. This past weekend after a 5 month drought we got 4” of rain in 2 days, so they all are now looking very sprightly!
We have root borers and get that kind of dieback. Larry already said how to check for signs of them. Unfortunately, I don’t know any way to get rid of them. We just generally accept the percentage of loss.
Yes, the boring can occur underground also. Root borers would eventually affect the entire clump whereas cane borers would affect individual canes. Get rid of any affected canes or clumps.
Could also be …
Thank you for all the great replies! Ill check for damage on the stalks today. Do you all usually only cut out the stalks to begin with and see how they do? Or do you remove the entire clump even if only a few stalks have damage?
Prune / cut below damage , save clump