Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Phytophthora?
Our large old Camellia has some problem that is causing it's old leaves to
fall before their usual time, I'm not convinced it's Phytophthora as the necrosis does not spread down the midrib of the leaves, that is the last place to die. First noticed this problem about 2 years ago. I've uploaded some photos I took today at.... http://www.flickr.com/photos/bobhobd...7626110259390/ Another lily flowered Camellia about 15ft away is unaffected as is "Madame de Strekaloff" in the front garden. What do the experts think, Phytophthora or a virus or something else? -- Regards Bob Hobden W.of London. UK |
#2
|
|||
|
|||
Phytophthora?
On Tue, 22 Feb 2011 15:18:53 -0000, "Bob Hobden"
wrote: Our large old Camellia has some problem that is causing it's old leaves to fall before their usual time, I'm not convinced it's Phytophthora as the necrosis does not spread down the midrib of the leaves, that is the last place to die. First noticed this problem about 2 years ago. I've uploaded some photos I took today at.... http://www.flickr.com/photos/bobhobd...7626110259390/ Another lily flowered Camellia about 15ft away is unaffected as is "Madame de Strekaloff" in the front garden. What do the experts think, Phytophthora or a virus or something else? Have you tested the pH of the soil around the camellia? I had one go like that a while back and cured the problem once I'd discovered that the pH of the soil had changed. AFAIK, the kernoviae variant of the dreaded "P" is the only one that would attack a camellia but that's (again AFAIK) currently confined to Cornwall and, dammit, South Wales! If you want to be sure", you can get a kit from the link below that tests for all forms of it. I lost a rhododendron and was worried as "P"s been found not far from me and it sort of looked right as the culprit. The test reassures if nothing else and in my case avoided the complications arising from discovery. http://www.pocketdiagnostic.com/products/31 |
#4
|
|||
|
|||
Phytophthora?
Am 22.02.2011 16:18, schrieb Bob Hobden:
I've uploaded some photos I took today at.... http://www.flickr.com/photos/bobhobd...7626110259390/ Can you unequivocally exclude simple sunburn? e.g. http://www.kamelien.de/magazin/nr03/sonne.htm Cheers Gotthelf |
#5
|
|||
|
|||
Phytophthora?
On Feb 23, 11:33*am, Janet wrote:
In article , says... On Tue, 22 Feb 2011 18:24:44 -0000, Janet wrote: In article , says... On Tue, 22 Feb 2011 15:18:53 -0000, "Bob Hobden" wrote: Our large old Camellia has some problem that is causing it's old leaves to fall before their usual time, I'm not convinced it's Phytophthora as the necrosis does not spread down the midrib of the leaves, that is the last place to die. *Phytophthera doesn't always spread down the midrib, we often see it as random *spots here. This has some good pics http://www.fera.defra.gov.uk/plants/.../factsheets/ph ytophthoraKernoviaeFactsheet.pdf *Your pics don't look like any of the phytophthera I've seen up here. AFAIK, the kernoviae variant of the dreaded "P" is the only one that would attack a camellia but that's (again AFAIK) currently confined to Cornwall and, dammit, South Wales! * Wrong on both counts I'm afraid, camellia IS one of the hostplant/victims to p ramorum http://www.plantmanagementnetwork.or...2006/camellia/ and p kernoviae has been active here in Scotland (Arran) for at least 3 years... first noticed here in *2008. http://www.scotland.gov.uk/Resource/Doc/915/0103583.pdf *Janet (Arran) Thanks Janet. My info was from a mix of Forestry Commisison docs and a chat with a helpline when researching my almost-dead rhododendron last year. As a result, I've only been keeping an eye on the spread of kernoviae variant but will now watch ramorum as well. * * Professional gardeners here, are of the opinion that *ramorum and kernoviae are uncontainable; and almost certainly far more wide spread than is officially *recorded. Not just because of the nature of their infectivity, but because the draconian official consequences imposed on the owners of infected plants are a serious disincentive to notification. * Janet.- Hide quoted text - - Show quoted text - Well usually when alien species are 'discovered' to be causing trouble by the powers that be, it transpires that the organism has been present but overlooked for some considerable time. They then make a fruitless show of attempts at containment, just going through the motions and even talk of eradication for a while before turning their attention to control if it turns out to be required. The most recent example of this that I have been personally involved with was the Varroa mite of honeybees. So I tend to agree with your professional contacts. Rod |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
[IBC] Phytophthora in Calif. | Bonsai | |||
[IBC] Phytophthora in Calif. | Bonsai | |||
[IBC] Phytophthora in Calif. | Bonsai | |||
[IBC] Phytophthora in Calif. | Bonsai | |||
[IBC] Phytophthora in Calif. | Bonsai |