Dying Avacado (forum)

Avocardo Help starts with ...
Hi

I need help with trying to save my old Avocado tree. over the past 2 years it has stopped fruiting and the leaves have gone brown and falling off. End of Branches are going Black. Thanks in advance.
Matt
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Time: 29th August 2018 9:35am

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Wandi
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Luke :) says...
I would think it has something to do with the roots, if you dont think it is root rot maybe something is attacking the roots?
I would get digging and investigate.

Is there clay where you are maybe the feeder roots have reached the clay, which could cause root rot as well as a potential PH problem.

Time: 12th September 2018 9:16pm

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Original Post was last edited: 13th September 2018 12:29am
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Markmelb says...
Ive read that as little as 3 days of flooded land can cause root rot and kill an Avo - even the original Hass died of Phytophthora after 76 years.
https://en.wikipedia.org/wiki/Hass_avocado

Time: 13th September 2018 6:38pm

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jakfruit etiquette says...
I worked on an Avo farm in Nth NSW. To combat root problems they grew the trees on slight mounds, mulched heavily with woodchips to create a permanent composting biological layer.
Composted chicken manure is also effective against Phytophora root rot, as is Phos acid. I would try to get the soil biological activity increased. ps is the soil salty ??

Time: 13th September 2018 10:04pm

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Luke :) says...
Chicken manure as an effective anti fungal!, who'd have known?
Cheers for the tip jakfruit'
You learn something new everyday on this forum.
I wonder if other bird manure would also be effective, like from cockatoo and budgie aviaries?🤔

Time: 17th September 2018 3:29am

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Markmelb says...
What about pigeon poo? can get hold of this from some pigeon racing people?or is it too nitrogenous?

Time: 17th September 2018 8:20am

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jakfruit etiquette says...
Composted chicken manure is also effective against Phytophora root rot, as is Phos acid. It was specifically Composted chicken manure against Phytophora. Interesting that Chicken manure is high in Phosphorus and the chemical Phos acid is also treatment for Phytophora.

Time: 17th September 2018 9:34pm

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Markmelb says...
jackfruit - what do you think of using Richgrow organic Fert made from Bat Guano? On Avos, Citrus (Fingerlimes) or did i read somewhere to treat fingerlimes with Native Fert low in Phos? - im experimenting with it to push a marcotted Wampi that refuses to flower that i cinctured a branch on as well last year?

Time: 19th September 2018 9:35am

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jakfruit etiquette says...
Hi Mark, if you mean Mega Booster Phosphorus Organic Fertiliser its ZeroN15PZeroK. Not sure if the ageing process of the bat guano is comparable to composting. 15% P seems quite high to use on its own. For Citrus, I was advised to go for low P of 1% to 2% to avoid Phosphorus induced Iron deficiency.
There is plenty of composted chicken fert pellets readily available.
Same with the pigeon poo, its more about the composting than the NPK.
https://www.google.com.au/search?source=hp&ei=jzWiW4mtKMTg-Ab-0qu4Aw&q=composted+chicken+manure+phytophora&oq=composted+chicken+manure+phytophora&gs_l=psy-ab.3..33i160k1.1780.26793.0.28219.39.35.0.3.3.0.518.6123.2-5j4j5j2.16.0....0...1c.1.64.psy-ab..20.19.6209.0..0j35i39k1j0i131k1j0i3k1j0i22i30k1j33i21k1.0.P7Z--YvPELY


Time: 19th September 2018 9:45pm

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Markmelb says...
Jackfruit - thanks for research - yes that the one im using sparingly - is a medium release - not using on Citrus but some plants like Eugenias like a bit of P
This trial of worm castings on Avos was of interest over Aliette http://www.avocadosource.com/WAC2/WAC2_p143.pdf

Time: 20th September 2018 8:28am

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Luke :) says...
Awesome info Jackfruit, but I'm just not sure how well certain species of bacteria will work against Phytophthora, if there is a large population of it to begin with.

I'm sure composted manure has some measurable effect, to be sure!...but I reckon you need to throw in a 'grenade' first like Hydrogen Peroxide to disturb the Phytophthora enough to allow the beneficial bacteria from the composted
chicken manure to take hold faster and more effectively.

Or it may be negligible since chicken manure high in Phos is the 'grenade' along with the beneficial bacteria from the chicken manure itself, creating two pronged attack against Phytophthora.


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As I said in the &quote;Avocado leaves going brown&quote; thread, I use Hydrogen Peroxide for root rot diseases, but only on a small scale, like for plants in pots.

Where I'll soak the whole media in Hydrogen Peroxide, then once inert and dry from any residual Hydrogen Peroxide, I'll apply a beneficial bacterial product like &quote;NTS Nutri-Life Micro-Force&quote; as a soak to repopulate the inert media.

I think for ground applications high Phos related products would be better for the bacterial community than Hydrogen Peroxide.

Hope this helps with your root rot problems.


Time: 7th October 2018 9:34pm

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jakfruit etiquette says...
Hi Luke, I remember that Hydrogen Peroxide is put thru irrigation(drippers?)
on cucumber crops in Japan as a preventative treatment. Yes, it would be better to start out from day one with beneficial microbes, and techniques to promote them, than to try to correct disease problems when symptoms are severe.

Time: 11th October 2018 10:15pm

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