Phytophthora cinnamomi

jenny.mick · 11th October 2009, 09:10 AM

Re trees dying in our garden , it looks like it is Phytophthora cinnamomi, it appears to have started in a southern mahogany which died last year and is working in a line. So far claiming italian alder, tulip tree, japanese cedar , parrotia persica, and a golden elm .

Any ideas how to contain this would be appreciated.

Sean Freeman · 11th October 2009, 10:11 AM

Hi Jenny,

If you believe that your plants are being damaged by any fungal pathogen then you really should try to get a positive ID first and foremost.

It certainly is possible that you might have Phytophthora affecting your garden, but it might be a waste of money investing in any specific treatments when the problem could be something else.

Have you enquired at the 'Plant Disease and Diagnostic Unit' at the Royal Botanic Gardens Sydney? Whilst their focus is more on the threat to bushland they might be able to direct you to the nearest plant pathology lab, or even tell you if they think it likely that Phytophthtora would be in the soils in your town/area.....02 9231 8138/ 9231 8189 pddu@rbgsyd.nsw.gov.au

Sean Freeman · 11th October 2009, 10:15 AM

You probably have already read this but in case you have not and for others that might not and could find it useful....

Phytophthora root rot - Botanic Gardens Trust - Sydney, Australia

Eric Frei · 11th October 2009, 01:04 PM

Recent PDF attached about this fungi.

Also some info in this thread.

All about fungi

Western Australia has had large expanses of bushland devastated by the disease, potassium phosphonate (Aus-phos) is used successfully to control it via aerial spraying.

From page 26/27 of the attached PDF ...

Quote:

Chemical intervention
The most promising agent for controlling P. cinnamomi is potassium phosphonate51, a systemic fungicide thought to also trigger and/or enhance intracellular barrier formation to resist the pathogen’s passage through a plant. The effect may last for up to five years. Potassium phosphonate is being applied routinely in high value areas in Western Australia both through tree injections and spraying foliage by hand, and by aircraft. In Victoria, the
use of potassium phosphonate is being trialled at places such as Wilsons Promontory, Aireys Inlet52 and the Brisbane Ranges. At the latter site, potassium phosphonate is being trialled for the protection of Scented Bush-pea, Pultenaea graveolens, a threatened native plant species.
Clarification is needed on the use of potassium phosphonate to control natural spread of P. cinnamomi53.
The use of potassium phosphonate may benefit vegetation downhill of infected sites where water movement will lead to inevitable infestation. It may also be possible to create a vegetative barrier to uphill movement of the pathogen that normally occurs via contact with infected roots.
The optimal concentration of potassium phosphonate needed to induce resistance while not burning foliage varies between vegetation types. Furthermore, potential detrimental effects on non-target plant species and some fauna means that management of P. cinnamomi by potassium phosphonate control must be judicious and guided by research and adaptive
management.

Also the avocado industry inject Aus-phos to control the disease. As the disease is in your trees I would inject them, they can be saved no problem without having to drench or treat all the soil and other plants.

11th October 2009, 09:10 AM	#1
jenny.mick I'm new here so be nice Join Date: Oct 2009 Location: candelo Posts: 2	Phytophthora cinnamomi Re trees dying in our garden , it looks like it is Phytophthora cinnamomi, it appears to have started in a southern mahogany which died last year and is working in a line. So far claiming italian alder, tulip tree, japanese cedar , parrotia persica, and a golden elm . Any ideas how to contain this would be appreciated.

11th October 2009, 10:11 AM	#2
Sean Freeman Veteran Heritage Status Join Date: Feb 2007 Location: Townsville Nth Queensland & Gold Coast Sth Queensland Posts: 1,981	Re: Phytophthora cinnamomi Hi Jenny, If you believe that your plants are being damaged by any fungal pathogen then you really should try to get a positive ID first and foremost. It certainly is possible that you might have Phytophthora affecting your garden, but it might be a waste of money investing in any specific treatments when the problem could be something else. Have you enquired at the 'Plant Disease and Diagnostic Unit' at the Royal Botanic Gardens Sydney? Whilst their focus is more on the threat to bushland they might be able to direct you to the nearest plant pathology lab, or even tell you if they think it likely that Phytophthtora would be in the soils in your town/area.....02 9231 8138/ 9231 8189 pddu@rbgsyd.nsw.gov.au

11th October 2009, 10:15 AM	#3
Sean Freeman Veteran Heritage Status Join Date: Feb 2007 Location: Townsville Nth Queensland & Gold Coast Sth Queensland Posts: 1,981	Re: Phytophthora cinnamomi You probably have already read this but in case you have not and for others that might not and could find it useful.... Phytophthora root rot - Botanic Gardens Trust - Sydney, Australia

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