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This is a silhouette of my two plums:

enter image description here

They are very old, around 10m high, for some longish time left alone, and exude a lot of sap. They have nice fruit. Birds like to rest and observe the area in their high crowns.

Is there anything I can do to revitalize them? Or just leave them as is?

  • When you say they emit a lot of sap, what does that mean? Where is the sap coming from? – Bamboo Dec 12 '17 at 16:07
  • From the trunk. @Bamboo – VividD Dec 12 '17 at 16:09
  • hmm, well a photo of the area of trunk that's leaking sap would be helpful. Is it leaking amber coloured sap, or clear? – Bamboo Dec 12 '17 at 16:21
  • Amber. @Bamboo There are also several holes with average diameter 8cm in the trunk, made obviously by birds. – VividD Dec 12 '17 at 16:36
  • Sounds like gummosis, which may or may not be fatal... photos would be good. Gummosis can be a major problem if there's bacterial (rather than viral, which it probably isn't) involvement, some reading here 100flowers.win/Article/questionandanswer/plantdiseases/201608/…, but photos would still be good. One question though - do you have tree borers in your country? (we don't in the UK, but they do in the States and other places) – Bamboo Dec 12 '17 at 18:23
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If the sap they are exuding is gelatinous in consistency (and my answer is making that assumption), then it means they have a fungus which is highly contagious to other stone fruit trees. I think you best option would be to cut the trees down, and plant non-stone-fruit trees or wait 3 years and then plant plums of your choice.

  • Is 'gelatinous in consistency' = 'consistently gelatinous'? Also, I have no idea how to tell if sap is 'gelatinous'. :) – VividD Dec 12 '17 at 18:49
  • If the tree dies, would the virus dissapear? – VividD Dec 12 '17 at 18:51
  • Does it look like water or does it look like gelatin? Water makes the tree look wet, gelatin will be thick. The virus will remain in the ground for a few years, you are advised not to plan another prunus tree there for at least 3 years. – Escoce Dec 12 '17 at 19:06
  • More like gelatin – VividD Dec 12 '17 at 19:07
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    No, the fungus incubates in the dead wood and sends spores out into the air in the spring. – Escoce Dec 12 '17 at 20:09

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