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Your rose looks great - but you realize that the canes are hollow and have been eaten out from the inside. You've got a cane borer infestation.

You rarely see the actual insect - you just find the result of the insect putting its larvae inside your rose plant. The larvae eat out the innards of your rose canes, leaving you behind a hollow plant.

If you see your canes starting to be damaged, cut off the damaged part of the cane. Look for where the borer got in, and seal up the holes with pruning compound.