Wound paints and dressings claim to prevent rot and help trees heal from pruning wounds, but research suggests that in most cases they actually do more harm than good.
Insect entry is not prevented by tree wound paints. Insects will still bore into dying wood above and below the wound-dressed area. Treating with wound dressings is mainly cosmetic in effect.
Prune the canes below the infected areas. All infected canes should be discarded and, if possible, destroyed. To prevent new infection, spray the pruned ends of the living canes and any visible wounds with plant-wound paint.
3. Japanese Beetles ...
 See also: Plant, High, Water, Growing, Wood
  
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