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#21
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RE: RE: Bark splitting syndrome
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<pre>Phil ... Thanks for putting the split bark photo online. I could be wrong but my best bet is that it is sunburn or frost with a tendency towards sunburn. I have often seen the same problem in groves where heavy pruning has been done which then exposes the trunk to a sun intensity it was not used to. (It sometimes appears as "scales" of bark lifting from the trunk exposing the wood below.) It may even be that the large branch which has been removed from that side of the tree (see photo) was actually shading the area from the sun. As I say, I could be wrong but to me it is a fairly classic sunburn. You may find a white fungus starting to develop in the splits and and under the surrounding bark over late summer/autumn but I've not studied to see whether this fungus would need controlling. Does anyone have thoughts on how to stop the dead tissue in the split areas from spreading around the trunk? I have been surprised at the relatively low levels of light which can cause sunburn on freshly exposed olive trunks. It seems that if an area was heavily shaded prior to pruning then it is very susceptible to sunburn. Kind regards, Julian Archer Olives Australia -----Original Message----- From: Phil Bramley [mailto:bramleyp@one.net.au] Sent: Thursday, 11 January 2001 10:12 To: OliveOil@egroups.com Subject: RE: [OliveOil] RE: Bark splitting syndrome Hi Alan, I have just posted a photo to the egroup web site under "files' If you search around there you will find a spot for photos and the culprit is lurking somewhere there. If you have difficulty finding it I will send it to you directly. Regards, Phil Bramley Tanja Olives -----Original Message----- From: A& J Leslie [mailto:woonona.bulga@bigpond.com] Sent: Thursday, 11 January 2001 7:35 AM To: OliveOil@egroups.com Subject: Re: [OliveOil] RE: Bark splitting syndrome Alan and Steve, This syndrome appears to be spreading throughout our grove....... We have observed that it is mostly on the east side of the trees...i.e. if you stood on the west side of the trees it would not be obvious. Some of the trees are also exhibiting dieback on the branches...the leaves at the tips seem OK but the branch back to the trunk is losing leaves. Our agronomist's report indicated that boron was low (18 mg/kg PTA) so we have sprayed for that and wait and see. I must admit to being confused about these measurements though. These guys say 18 mg/kg PTA is low (I have no idea what PTA means) but Burr says 19 ppm is normal and deficient is <14 ppm...so this is not the same measurement it seems. Alan, could you send us a photograph so we can see if what you have is the same as what we have ? Thanks Best regards Alan & Judith Leslie "Woonona" Hunter Valley Australia ----- Original Message ----- From: Alan Watt <wattmeyer@one.net.au> To: <wattmeyer@one.net.au> Cc: OliveOil@egroups. com <OliveOil@egroups.com> Sent: Wednesday, 10 January 2001 23:18 Subject: [OliveOil] RE: Bark splitting syndrome > > > > -----Original Message----- > > From: Alan Watt [mailto:wattmeyer@one.net.au] > > Sent: Wednesday, 10 January 2001 12:24 > > To: Steve Sibbett > > Subject: Bark splitting syndrome > > > > Steve, > > Thanks for your ongoing interest and comment on the bark > > splitting syndrome. It remains a mystery. I have asked colleague > > Phil Bramley to take some digital photos of the two trees in > > questions to place on the group's pic. file for your information, > > the Leslie's of Hunter Valley, and anyone else that may have a > > similar problem or simply an interest. > > It seems we have eliminated Boron deficiency, chemical contact > > [or at least nothing intentionally applied], frost[I get none in > > the area in question],sunburn > > [It rarely gets very hot right on the coast] and there certainly > > has been no fire. > > Perhaps the application of sheep manure at the tree sites on > > planting [2 years ago] was a little excessive. They received on > > average a 1/4 bag of old manure per tree. > > You will notice from the photos that the short vertical splits > > develop on a lumpy, varicose vein-like surface of the bark. The > > Leslie's aptly describe it as being like burst blisters. Maybe > > Stan Kailis, as specialist in plant sciences, has some ideas. > > One interesting observation Phil and I made while taking the > > photographs is that the tree, which appeared long dead, was > > actually alive [green under the bark surface] below the graft > > scar. There was no evidence of basal shoots. > > I did receive your photos of the flowers and will use them next > > bloom period. > > > > > > Alan Watt, Tanja Olives > > > [Non-text portions of this message have been removed] > > > **** INDUSTRY LINKS **** http://www.egroups.com/Links/OliveOil > > ************************************************** *** > Addresses: > Post message: OliveOil@egroups.com > Subscribe: OliveOil-subscribe@egroups.com > Unsubscribe: OliveOil-unsubscribe@egroups.com > List owner: OliveOil-owner@egroups.com > URL to this page: http://www.egroups.com/group/OliveOil > > ******* A MESSAGE FROM THE MODERATOR ******** 2.6. When replying to a post, do not include the entire text of the original post. Keep only what is relevant. By selectively deleting unnecessary parts of the original text, you will make your reply easier to follow. To show where you delete text, the <snip> notation may be used. ************************************************** *** INDUSTRY BOOKS: http://sadoun.bizland.com/olive.htm ************************************************** *** Addresses: Post message: OliveOil@egroups.com Subscribe: OliveOil-subscribe@egroups.com Unsubscribe: OliveOil-unsubscribe@egroups.com List owner: OliveOil-owner@egroups.com URL to this page: http://www.egroups.com/group/OliveOil ******* A MESSAGE FROM THE MODERATOR ******** 2.6. When replying to a post, do not include the entire text of the original post. Keep only what is relevant. By selectively deleting unnecessary parts of the original text, you will make your reply easier to follow. To show where you delete text, the <snip> notation may be used. ************************************************** *** INDUSTRY BOOKS: http://sadoun.bizland.com/olive.htm ************************************************** *** Addresses: Post message: OliveOil@egroups.com Subscribe: OliveOil-subscribe@egroups.com Unsubscribe: OliveOil-unsubscribe@egroups.com List owner: OliveOil-owner@egroups.com URL to this page: http://www.egroups.com/group/OliveOil </pre> </td></tr></table> |
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#22
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RE: RE: Bark splitting syndrome
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<pre>Julian: What I've seen of sunburn is that it is usually confined to one side of the tree trunk or limb (one report suggests this - I'm not sure about others) - the exposed side (here it is the south and west sides or upper sides). Further, if more than one tree is effected, the damage is on the same sides of trunks/limbs on the effected trees. Although I cannot see all sides of the effected tree in the photo, this doesn't look like the sunburn I have seen here. On sunburn injured trees here we don't see the deep splits, we see a flattened, dead area where the thin bark sloughs off and the tissue is dead underneath - callusing occurs on the margins of the injury. I wonder if some are experiencing sunburn while others have something else. I looked at the picture (the one that was sent to me) and noticed a couple of things; 1) the injury developed about 2" above ground level and extended upward (It seems to me that sunburn would have occurred at ground level too - this is the hottest area due to reflection); 2) there were two older pruning wounds on the damaged trunk; 3) the damage looked like it happened some time ago (there was considerable callusing below the splits causing the bulging outward). This begged several questions: 1) was Roundup used when the trees were quite young and the bark not fully mature (drift onto immature trunk tissue could result in this symptom)?; 2) was Roundup drifted up onto fresh pruning wounds on the trunk (this looks like systemic herbicide type damage that could have resulted from penetration into a fresh cut - tip die-back could occur as well as the material is systemic)?; 3) were trunk wraps used (I've seen this type of damage when rubberized wraps were used and they stayed continually wet from the irrigation system before they were removed - the bark never really matures and when exposed, has abnormal growth)?; 4) is the tissue dead on the entire surface (like sunburn) or just around the splits with some healthy surface tissue in between (looks like growth is occurring but not immediately under the splits thus the "bumpy" growth appearance)?; 5) does tissue death extend into the tree (sunburn) or is there live tissue trying to heal the wounds around the splits (i.e. is callusing occurring - looks like it to me)?; Has the problem run its coarse or is it continuing to develop from one year to the next (It seems like there are different reports)?. One thing, this doesn't look like Boron deficiency to me although there are several reports of low/deficient leaf tissue levels. In any event, where these occur, I'd be applying B. Steve Sibbett U.C. Farm Advisor Phone - office 559.733.6486 Mobil 559.280.0666 FAX 559.734.2708 -----Original Message----- From: Julian Archer [mailto:jarcher@adra.org.au] Sent: Thursday, January 11, 2001 3:41 PM To: OliveOil@egroups.com Subject: RE: [OliveOil] RE: Bark splitting syndrome Phil ... Thanks for putting the split bark photo online. I could be wrong but my best bet is that it is sunburn or frost with a tendency towards sunburn. I have often seen the same problem in groves where heavy pruning has been done which then exposes the trunk to a sun intensity it was not used to. (It sometimes appears as "scales" of bark lifting from the trunk exposing the wood below.) It may even be that the large branch which has been removed from that side of the tree (see photo) was actually shading the area from the sun. As I say, I could be wrong but to me it is a fairly classic sunburn. You may find a white fungus starting to develop in the splits and and under the surrounding bark over late summer/autumn but I've not studied to see whether this fungus would need controlling. Does anyone have thoughts on how to stop the dead tissue in the split areas from spreading around the trunk? I have been surprised at the relatively low levels of light which can cause sunburn on freshly exposed olive trunks. It seems that if an area was heavily shaded prior to pruning then it is very susceptible to sunburn. Kind regards, Julian Archer Olives Australia -----Original Message----- From: Phil Bramley [mailto:bramleyp@one.net.au] Sent: Thursday, 11 January 2001 10:12 To: OliveOil@egroups.com Subject: RE: [OliveOil] RE: Bark splitting syndrome Hi Alan, I have just posted a photo to the egroup web site under "files' If you search around there you will find a spot for photos and the culprit is lurking somewhere there. If you have difficulty finding it I will send it to you directly. Regards, Phil Bramley Tanja Olives -----Original Message----- From: A& J Leslie [mailto:woonona.bulga@bigpond.com] Sent: Thursday, 11 January 2001 7:35 AM To: OliveOil@egroups.com Subject: Re: [OliveOil] RE: Bark splitting syndrome Alan and Steve, This syndrome appears to be spreading throughout our grove....... We have observed that it is mostly on the east side of the trees...i.e. if you stood on the west side of the trees it would not be obvious. Some of the trees are also exhibiting dieback on the branches...the leaves at the tips seem OK but the branch back to the trunk is losing leaves. Our agronomist's report indicated that boron was low (18 mg/kg PTA) so we have sprayed for that and wait and see. I must admit to being confused about these measurements though. These guys say 18 mg/kg PTA is low (I have no idea what PTA means) but Burr says 19 ppm is normal and deficient is <14 ppm...so this is not the same measurement it seems. Alan, could you send us a photograph so we can see if what you have is the same as what we have ? Thanks Best regards Alan & Judith Leslie "Woonona" Hunter Valley Australia ----- Original Message ----- From: Alan Watt <wattmeyer@one.net.au> To: <wattmeyer@one.net.au> Cc: OliveOil@egroups. com <OliveOil@egroups.com> Sent: Wednesday, 10 January 2001 23:18 Subject: [OliveOil] RE: Bark splitting syndrome > > > > -----Original Message----- > > From: Alan Watt [mailto:wattmeyer@one.net.au] > > Sent: Wednesday, 10 January 2001 12:24 > > To: Steve Sibbett > > Subject: Bark splitting syndrome > > > > Steve, > > Thanks for your ongoing interest and comment on the bark > > splitting syndrome. It remains a mystery. I have asked colleague > > Phil Bramley to take some digital photos of the two trees in > > questions to place on the group's pic. file for your information, > > the Leslie's of Hunter Valley, and anyone else that may have a > > similar problem or simply an interest. > > It seems we have eliminated Boron deficiency, chemical contact > > [or at least nothing intentionally applied], frost[I get none in > > the area in question],sunburn > > [It rarely gets very hot right on the coast] and there certainly > > has been no fire. > > Perhaps the application of sheep manure at the tree sites on > > planting [2 years ago] was a little excessive. They received on > > average a 1/4 bag of old manure per tree. > > You will notice from the photos that the short vertical splits > > develop on a lumpy, varicose vein-like surface of the bark. The > > Leslie's aptly describe it as being like burst blisters. Maybe > > Stan Kailis, as specialist in plant sciences, has some ideas. > > One interesting observation Phil and I made while taking the > > photographs is that the tree, which appeared long dead, was > > actually alive [green under the bark surface] below the graft > > scar. There was no evidence of basal shoots. > > I did receive your photos of the flowers and will use them next > > bloom period. > > > > > > Alan Watt, Tanja Olives > > > [Non-text portions of this message have been removed] > > > **** INDUSTRY LINKS **** http://www.egroups.com/Links/OliveOil > > ************************************************** *** > Addresses: > Post message: OliveOil@egroups.com > Subscribe: OliveOil-subscribe@egroups.com > Unsubscribe: OliveOil-unsubscribe@egroups.com > List owner: OliveOil-owner@egroups.com > URL to this page: http://www.egroups.com/group/OliveOil > > ******* A MESSAGE FROM THE MODERATOR ******** 2.6. When replying to a post, do not include the entire text of the original post. Keep only what is relevant. By selectively deleting unnecessary parts of the original text, you will make your reply easier to follow. To show where you delete text, the <snip> notation may be used. ************************************************** *** INDUSTRY BOOKS: http://sadoun.bizland.com/olive.htm ************************************************** *** Addresses: Post message: OliveOil@egroups.com Subscribe: OliveOil-subscribe@egroups.com Unsubscribe: OliveOil-unsubscribe@egroups.com List owner: OliveOil-owner@egroups.com URL to this page: http://www.egroups.com/group/OliveOil ******* A MESSAGE FROM THE MODERATOR ******** 2.6. When replying to a post, do not include the entire text of the original post. Keep only what is relevant. By selectively deleting unnecessary parts of the original text, you will make your reply easier to follow. To show where you delete text, the <snip> notation may be used. ************************************************** *** INDUSTRY BOOKS: http://sadoun.bizland.com/olive.htm ************************************************** *** Addresses: Post message: OliveOil@egroups.com Subscribe: OliveOil-subscribe@egroups.com Unsubscribe: OliveOil-unsubscribe@egroups.com List owner: OliveOil-owner@egroups.com URL to this page: http://www.egroups.com/group/OliveOil ******* A MESSAGE FROM THE MODERATOR ******** 2.6. When replying to a post, do not include the entire text of the original post. Keep only what is relevant. By selectively deleting unnecessary parts of the original text, you will make your reply easier to follow. To show where you delete text, the <snip> notation may be used. ************************************************** *** INDUSTRY BOOKS: http://sadoun.bizland.com/olive.htm ************************************************** *** Addresses: Post message: OliveOil@egroups.com Subscribe: OliveOil-subscribe@egroups.com Unsubscribe: OliveOil-unsubscribe@egroups.com List owner: OliveOil-owner@egroups.com URL to this page: http://www.egroups.com/group/OliveOil </pre> </td></tr></table> |
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#23
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RE: RE: Bark splitting syndrome
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<pre>Julian, The area in which the tree is planted is not a frost prone area and in fact I doubt if the paddock has seen a frost for a very long time. With the sea being so close the temperature of our groves (in this case Alan's grove)are not affected by frost. The same could probably be said for the sunburn theory because there are no other trees that exhibit this kind of bark splitting. Anyway I am waiting for Alan to come back online to answer some of the other questions such as roundup usage etc etc. and his recollection of his planting practice in this particular case. Regards, Phil Bramley Tanja Olives For Alan and Judith Leslie Did you manage to locate the photo on the egroup File - digital photographs web page? If not perhaps you might like a copy sent to you directly. Phil -----Original Message----- From: Julian Archer [mailto:jarcher@adra.org.au] Sent: Friday, 12 January 2001 10:41 AM To: OliveOil@egroups.com Subject: RE: [OliveOil] RE: Bark splitting syndrome Phil ... Thanks for putting the split bark photo online. I could be wrong but my best bet is that it is sunburn or frost with a tendency towards sunburn. I have often seen the same problem in groves where heavy pruning has been done which then exposes the trunk to a sun intensity it was not used to. (It sometimes appears as "scales" of bark lifting from the trunk exposing the wood below.) It may even be that the large branch which has been removed from that side of the tree (see photo) was actually shading the area from the sun. As I say, I could be wrong but to me it is a fairly classic sunburn. You may find a white fungus starting to develop in the splits and and under the surrounding bark over late summer/autumn but I've not studied to see whether this fungus would need controlling. Does anyone have thoughts on how to stop the dead tissue in the split areas from spreading around the trunk? I have been surprised at the relatively low levels of light which can cause sunburn on freshly exposed olive trunks. It seems that if an area was heavily shaded prior to pruning then it is very susceptible to sunburn. Kind regards, Julian Archer Olives Australia -----Original Message----- From: Phil Bramley [mailto:bramleyp@one.net.au] Sent: Thursday, 11 January 2001 10:12 To: OliveOil@egroups.com Subject: RE: [OliveOil] RE: Bark splitting syndrome Hi Alan, I have just posted a photo to the egroup web site under "files' If you search around there you will find a spot for photos and the culprit is lurking somewhere there. If you have difficulty finding it I will send it to you directly. Regards, Phil Bramley Tanja Olives -----Original Message----- From: A& J Leslie [mailto:woonona.bulga@bigpond.com] Sent: Thursday, 11 January 2001 7:35 AM To: OliveOil@egroups.com Subject: Re: [OliveOil] RE: Bark splitting syndrome Alan and Steve, This syndrome appears to be spreading throughout our grove....... We have observed that it is mostly on the east side of the trees...i.e. if you stood on the west side of the trees it would not be obvious. Some of the trees are also exhibiting dieback on the branches...the leaves at the tips seem OK but the branch back to the trunk is losing leaves. Our agronomist's report indicated that boron was low (18 mg/kg PTA) so we have sprayed for that and wait and see. I must admit to being confused about these measurements though. These guys say 18 mg/kg PTA is low (I have no idea what PTA means) but Burr says 19 ppm is normal and deficient is <14 ppm...so this is not the same measurement it seems. Alan, could you send us a photograph so we can see if what you have is the same as what we have ? Thanks Best regards Alan & Judith Leslie "Woonona" Hunter Valley Australia ----- Original Message ----- From: Alan Watt <wattmeyer@one.net.au> To: <wattmeyer@one.net.au> Cc: OliveOil@egroups. com <OliveOil@egroups.com> Sent: Wednesday, 10 January 2001 23:18 Subject: [OliveOil] RE: Bark splitting syndrome > > > > -----Original Message----- > > From: Alan Watt [mailto:wattmeyer@one.net.au] > > Sent: Wednesday, 10 January 2001 12:24 > > To: Steve Sibbett > > Subject: Bark splitting syndrome > > > > Steve, > > Thanks for your ongoing interest and comment on the bark > > splitting syndrome. It remains a mystery. I have asked colleague > > Phil Bramley to take some digital photos of the two trees in > > questions to place on the group's pic. file for your information, > > the Leslie's of Hunter Valley, and anyone else that may have a > > similar problem or simply an interest. > > It seems we have eliminated Boron deficiency, chemical contact > > [or at least nothing intentionally applied], frost[I get none in > > the area in question],sunburn > > [It rarely gets very hot right on the coast] and there certainly > > has been no fire. > > Perhaps the application of sheep manure at the tree sites on > > planting [2 years ago] was a little excessive. They received on > > average a 1/4 bag of old manure per tree. > > You will notice from the photos that the short vertical splits > > develop on a lumpy, varicose vein-like surface of the bark. The > > Leslie's aptly describe it as being like burst blisters. Maybe > > Stan Kailis, as specialist in plant sciences, has some ideas. > > One interesting observation Phil and I made while taking the > > photographs is that the tree, which appeared long dead, was > > actually alive [green under the bark surface] below the graft > > scar. There was no evidence of basal shoots. > > I did receive your photos of the flowers and will use them next > > bloom period. > > > > > > Alan Watt, Tanja Olives > > > [Non-text portions of this message have been removed] > > > **** INDUSTRY LINKS **** http://www.egroups.com/Links/OliveOil > > ************************************************** *** > Addresses: > Post message: OliveOil@egroups.com > Subscribe: OliveOil-subscribe@egroups.com > Unsubscribe: OliveOil-unsubscribe@egroups.com > List owner: OliveOil-owner@egroups.com > URL to this page: http://www.egroups.com/group/OliveOil > > ******* A MESSAGE FROM THE MODERATOR ******** 2.6. When replying to a post, do not include the entire text of the original post. Keep only what is relevant. By selectively deleting unnecessary parts of the original text, you will make your reply easier to follow. To show where you delete text, the <snip> notation may be used. ************************************************** *** INDUSTRY BOOKS: http://sadoun.bizland.com/olive.htm ************************************************** *** Addresses: Post message: OliveOil@egroups.com Subscribe: OliveOil-subscribe@egroups.com Unsubscribe: OliveOil-unsubscribe@egroups.com List owner: OliveOil-owner@egroups.com URL to this page: http://www.egroups.com/group/OliveOil ******* A MESSAGE FROM THE MODERATOR ******** 2.6. When replying to a post, do not include the entire text of the original post. Keep only what is relevant. By selectively deleting unnecessary parts of the original text, you will make your reply easier to follow. To show where you delete text, the <snip> notation may be used. ************************************************** *** INDUSTRY BOOKS: http://sadoun.bizland.com/olive.htm ************************************************** *** Addresses: Post message: OliveOil@egroups.com Subscribe: OliveOil-subscribe@egroups.com Unsubscribe: OliveOil-unsubscribe@egroups.com List owner: OliveOil-owner@egroups.com URL to this page: http://www.egroups.com/group/OliveOil ******* A MESSAGE FROM THE MODERATOR ******** 2.6. When replying to a post, do not include the entire text of the original post. Keep only what is relevant. By selectively deleting unnecessary parts of the original text, you will make your reply easier to follow. To show where you delete text, the <snip> notation may be used. ************************************************** *** INDUSTRY BOOKS: http://sadoun.bizland.com/olive.htm ************************************************** *** Addresses: Post message: OliveOil@egroups.com Subscribe: OliveOil-subscribe@egroups.com Unsubscribe: OliveOil-unsubscribe@egroups.com List owner: OliveOil-owner@egroups.com URL to this page: http://www.egroups.com/group/OliveOil </pre> </td></tr></table> |
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#24
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Bark splitting syndrome
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<pre>Some further thoughts and observations on the bark splitting syndrome. The photos Phil posted certainly show some callousing and pruning scars. The first resulted from rabbits removing the bark at the base of the tree to the Cambrian layer; the second a tidy up pruning after kangaroos tackled the tree in a sparing match. Both injuries occurred about last June and neither was treated with a wound sealant. These were certainly not the only trees that suffered injuries from both animals. Some elimination of likely causes may be possible if the Leslie's of Hunter Valley recognise the problem [from the photos] as being the same as theirs. [I will arrange for Phil to sent the photos direct to you, Judith and Alan ,as you appear, like myself, mystified by the method of extracting from the group files] I also noticed that the bark splitting was more on the Eastern side but not exclusively. I concluded that the two trees in question being on the seaward and Eastern side of a large block of trees may have been more exposed to the prevailing sea winds. It may give some weight to the sunburn theory if the low morning rays were able to sneak beneath the general conopy of leaves. If the Leslie's problem is the same we can eliminate Roundup as the culprit as they use no herbicides. In answer to Steve's question about a skin tight wrap around the trunk - no, not even a 'growbag', hence the rabbit scars. His observation of growing tissue between the splits is correct, at least on the one alive. I feel sorry for the Leslie's if they are experiencing an ongoing problem with this bark splitting as I seem to have had only 2 trees affected. One dead above the graft the other I previously described as half dead now seems to be coming good leaving about 3 decidedly dead branches. If Steve's other suggestion of viral infection is a possibility are the Leslie's and I [about 600 Km. apart] the only suffers and is it confined to Oz? Alan Watt, Tanja Olives [Non-text portions of this message have been removed] </pre> </td></tr></table> |
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#25
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Re: Bark splitting syndrome
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<pre>We did pick up the picture from the Egroup files section... We would say that the Tanja bark splitting looks much older than ours... We have noticed it only in the last month or so... We don't use herbicides BUT we did use roundup 18 months ago around the young trees which were inside tree guards and well protected.....we haven't used any roundup for 18 months... We also notice that ours is exclusively on the east side ...except that the easternmost row which is shaded to the east by a row of eucalypts doesn't have any symptoms. We have noticed that this bark splitting blistering is spreading through out the field from the eastern corner to the western corner with the north and south flanks, genrally less infected. We are still mystified. We are getting some pictures done which we will post so you can see what it looks like. Best regards Alan Alan & Judith Leslie "Woonona" 339 Inlet Road Bulga, NSW 2330 Australia </pre> </td></tr></table> |
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#26
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RE: RE: Bark splitting syndrome
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<pre>Thanks Steve ... I must admit that I haven't been following the "Bark Splitting" story closely and I didn't go back through all of the notes to check such items as whether the splitting was occurring on various sides of the trees, or how it appeared when they first noticed it. Our sunburn symptoms here are the same as you speak of initially, but in bad cases, after a number of months growers often see the splitting take place as deeper tissue damage occurs, tissue dies, loses its moisture and shrinks. This is why I asked whether anyone knew of ways to stop the tissue damage from moving around the trunk (or deeper into the wood for that matter). Alan and Phil may have already ruled out sunburn in earlier emails if the splitting is regularly seen on other sides of the tree than the north and west (southern hemisphere). Cheers, Julian Archer Olives Australia -----Original Message----- From: Steve Sibbett [mailto:sibbett@lightspeed.net] Sent: Friday, 12 January 2001 11:01 To: OliveOil@egroups.com Subject: RE: [OliveOil] RE: Bark splitting syndrome Julian: What I've seen of sunburn is that it is usually confined to one side of the tree trunk or limb (one report suggests this - I'm not sure about others) - the exposed side (here it is the south and west sides or upper sides). Further, if more than one tree is effected, the damage is on the same sides of trunks/limbs on the effected trees. Although I cannot see all sides of the effected tree in the photo, this doesn't look like the sunburn I have seen here. On sunburn injured trees here we don't see the deep splits, we see a flattened, dead area where the thin bark sloughs off and the tissue is dead underneath - callusing occurs on the margins of the injury. I wonder if some are experiencing sunburn while others have something else. I looked at the picture (the one that was sent to me) and noticed a couple of things; 1) the injury developed about 2" above ground level and extended upward (It seems to me that sunburn would have occurred at ground level too - this is the hottest area due to reflection); 2) there were two older pruning wounds on the damaged trunk; 3) the damage looked like it happened some time ago (there was considerable callusing below the splits causing the bulging outward). This begged several questions: 1) was Roundup used when the trees were quite young and the bark not fully mature (drift onto immature trunk tissue could result in this symptom)?; 2) was Roundup drifted up onto fresh pruning wounds on the trunk (this looks like systemic herbicide type damage that could have resulted from penetration into a fresh cut - tip die-back could occur as well as the material is systemic)?; 3) were trunk wraps used (I've seen this type of damage when rubberized wraps were used and they stayed continually wet from the irrigation system before they were removed - the bark never really matures and when exposed, has abnormal growth)?; 4) is the tissue dead on the entire surface (like sunburn) or just around the splits with some healthy surface tissue in between (looks like growth is occurring but not immediately under the splits thus the "bumpy" growth appearance)?; 5) does tissue death extend into the tree (sunburn) or is there live tissue trying to heal the wounds around the splits (i.e. is callusing occurring - looks like it to me)?; Has the problem run its coarse or is it continuing to develop from one year to the next (It seems like there are different reports)?. One thing, this doesn't look like Boron deficiency to me although there are several reports of low/deficient leaf tissue levels. In any event, where these occur, I'd be applying B. Steve Sibbett U.C. Farm Advisor Phone - office 559.733.6486 Mobil 559.280.0666 FAX 559.734.2708 </pre> </td></tr></table> |
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#27
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Bark Splitting Syndrome
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<pre>For those that are interested, I have posted 8 pictures of the blistering and splitting on our olive trees. Go to FILES.....MEMBERS FOLDERS....BARK SPLITTING SYNDROME and the pics are in there. If anyone has seen this before, has it, or knows what it is, we'd appreciate hearing from you. Alan & Judith Leslie "Woonona" 339 Inlet Road Bulga, NSW 2330 Australia [Non-text portions of this message have been removed] </pre> </td></tr></table> |
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#28
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re: bark splitting syndrome
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<pre>Your pics look similar to rhizoctonia (spelling a bit unsure) or other similar soil borne diseases that are happy in poorly drained soils, or perhaps in some infected wood buried below ground. If your ground has been recently cleared there may still be old roots, stumps, this is where the pathogens love to hang out. What happens above ground to a great extent reflects what is happening below ground. Maybe the roots are being attacked by a disease, or burnt by acidity, or monstered by some excessive toxin eg sodium or manganese. Or just suffering from excesive magnesium. The only way to get a qualified opinion (can"t stress enough the importance of qualified, not just some blow-in) is to use a , for Oz, a NATA registered lab to do a) soil test b) leaf test c) soil pathogen test. Sounds expensive but I like the German saying, something like "I'm so poor I only can afford the best. Only the rich can experiment" Roger Farquhar [Non-text portions of this message have been removed] </pre> </td></tr></table> |
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#29
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re: bark splitting syndrome
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<pre>Further to the last, they (there's always the 'they') tell me that after harvesting by beating with sticks (in Europe) a spray of copper was applied. This has the effect of cleansing the wounds caused by the harvest. This method of harvest to some is also a form of pruning. Similarly with hail or any other injurious event, an application is needed. Even during winter there is still some sap therefore sterilising is always important so as to not spread infection from tree to tree, or to introduce it to the soil for further incubation. So, a protocol of hygiene is important so as to eliminate a possible source of disease to your trees. This would include sterilising of cutting equipment, sealing of all wounds including pruning, removal of prunings from site, no more doggies running around the trees doing their business - in fact, quarantine. Roger Farquhar [Non-text portions of this message have been removed] </pre> </td></tr></table> |
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#30
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Re: RE: Bark splitting syndrome
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<pre>Phil, Thanks we did see your photo all the weight of opinion now seems to be for hail damage perhaps exacerbated by sun. </pre> </td></tr></table> |
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