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 Botanic Garden >> Gardening >  >> Question and Answer >> Plant Species >> Roses

Eliminating Rose Cane Borers: Pruning and Sealing Techniques for Knockout Roses

Eliminating Rose Cane Borers: Pruning and Sealing Techniques for Knockout Roses

Worms in stems are rose cane borers. Larvae overwinter, emerge in spring. Sprays don't reach them inside canes.

Control

  1. Cut cane below damage until pith is white (healthy).
  2. Seal fresh cut with Elmer's glue to block re-entry.
  3. Add red food dye to glue to mark treated canes.

Repeat annually to reduce population.

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