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Alberto

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  1. Sometimes the draft of herbicide can affect only one or two leaf of a tree or an entire side, all depends on the interaction of the droplets with the wind. In the picture of your tree only one side show the damage and it gradually fade to the right of the crown It can be a combination of herbicide and other things watching this picture on pc make me think of a damage caused by the larvae of some insect. Unfortunatly i cant tell you more on this, i don't know which insect lives in Tasmania 🙂 Btw i think that the 80%-90% of the damage comes from an herbicide draft (i've seen a tree damaged by a draft coming from 1,5 - 2km far from sprayed crop) To help the tree i would suggest to spray it with a biostimulant, apply some organic fertilizer inside and 2 meter/6ft out of the drip line of the crown. Also wait to remove the death branches to be sure on how far they are death.
  2. Hello Billscot, It can be a fungus due to high humidity as other guys said. But reading this section made me think another thing It can be the effect of one or two types of herbicide applied in or near your garden transported by the wind onto the leaf. I often see that kind of damage on trees near agricoltural fields
  3. Hello! They are starting to split where they where pollarded so in my opinion for the others the best thing to do is to cable them and do a little wheight reduction and thinning in summer to keep the regrow on low level. I Think a 4-8 tons dinamic or semistatic cable would be right. For the broken one the best thing to do is to pollard it on a regular cycle of 1 to 3 years cutting the new branch at the same poin evry time without damaging the beach collar. A Lapsed pollard should never be cut back. Cutting them back will destroy the hormonal system of the tree and the big wound left will rot the main trunk. Another problem of cutting it back is that the root will no longer recieve nutriend and they will dieback.
  4. Hello Stuart, i've first read about it in a brochure where the research of Prof. Garofalo and Prof Pecchiai was cited. I've searched for it but probably they are old and avaible only on paper. Here in italy there are some company that produce and sell propolis extract for agricolture purpose (hailstorm damage, disease, sunburn, frost damage etc they said this) the same product are allowed and used in organic cultivation. I've found this research about propolis effect on fungi and bacteria: http://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/685 http://en.cnki.com.cn/Article_en/CJFDTotal-SPKX200612050.htm https://www.sciencedirect.com/science/article/abs/pii/S0260877405005819 I was not able to find a study about the propolis effect on wound but if you add the propriety listed above with the fact that you can find it in the bud and vegetative apex of plant to protect them, it makes sense
  5. Why Making fun of what i've said? The use of propolis to treat tree wound is not witchery. If you search for it you can find some research about it
  6. As you said, sealing a wound is not a good idea. You can trap inside bacteria and funghi spore. The high umidity of a sealed wound is the perfect enviroment for funghi growt. Maybe the manufacturer suggest to Seal it to prevent the spread of chemichal compound outside the tree. I've succesfully treated a bleeding wound caused by a strimmer on a Morus nigra using hydroalcolich extract of propolis, equisetum and the extract of seaweed all mixer togheter then spraied on the wound, you can give it a try
  7. It can be a sunburn as Darrin Turnbull sayd, the removal of the lower branches may have caused an exposure of the before shaded bark. Another option looking at the wooden house base, a root damage that caused the death of that bark zone. Did you cut some major root while building it? Can you tell me some more info on the tree? Previous damage, disease, ecc.. Loking at the picture, i see included bark in the codominant stem union that can split apart (second picture from the top) it's a good idea to call an arborist to check it and maybe cabling the tree

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