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Identification
Larvae of various beetles and sawflies that tunnel inside raspberry, blackberry, and rose canes; wilting cane tips are the first visible sign.
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Life Cycle
Adults lay eggs near cane tips in spring or summer; larvae bore downward through the pith before pupating.
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Damage Signs
Boring hollows out canes, causing tips to wilt and blacken and canes to snap or die back, reducing fruiting wood.
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Treatment
Cut out and destroy wilted cane tips well below the entry point as soon as symptoms appear.
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Prevention
Prune and burn old fruited canes each year to remove overwintering sites.