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Re: Potassium Phosphite

Subject: Re: Potassium Phosphite
From: John Gillbert
Date: Aug 22 2008 11:21:00 
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Yesterday a tree surgeon came up to me while doing a tree survey in a
London 
Park and asked me about the control of Phytophera.

He started talking about using Potassium Phosphite fertilizer over root
plate and spraying foliage with same that could reduce infection.

Anyone had any experience or knowledge, maybe on a very small scale.
It can be used to control Phytophera cactorum on strawberries on a search
on 
the web, rather different to a 10 m high tree.



Regards



Phillip Ellis



Hi Phillip,
Dr Glynn Percival of Bartlett Tree Research wrote an article on Phytophthora
bleeding canker in Horse Chestnut in Essential Arb issue 21.
From what I can gather from the article Phytophthora is able to mask its 
prescence enabling it to get a hold before the host plant can react.
If Phosphite is present in the plant cells then the Phytophthora is less
able to mask its presence so the plant is able to react quickly by
thickening cell walls elsewhere. This reduces further damage and can contain
the disease. If the plant is otherwise healthy and getting everything it
needs it may be able to kill the disease if alerted early enough.
Dr Percival says Phosphite should be applied (via soil injection and bark
spray treatment 3-4 times a year along with soil ameloriation (ph and
nutrients), applications of gypsum in spring or autumn to reduce spore
production, addition of under composed wood mulch (50-100mm deep to beyond
1m out from dripline) and use of a tensiometer to check against over or
under irrigation. 

Sounds expensive but may be worth it in the right situation.

Regards
John Gillbert 

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