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Topics - pagnr

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I recently read about this. Interesting because both are Fungicides with low off target problems, i.e. some of the "safer" fungicides to use.
Also various copper mixtures are residual, in the sense they stay on branches and leaves for a while.
I have encouraged this by adding milk powder to C Oxo and painting on trunks, or using a sticky version like Flo Bordeaux.
Also wondering how much these on plant residues could be affected by a later Phos Acid application, and for what period ?

Another warning was using Phos Acid fungicides on highly stressed trees.
Info came from here

Young and/or stressed trees are very sensitive to phosphorous acid-induced phytotoxicity (e.g. leaf spotting and defoliation). Experience has found rates exceeding 1.9g/L active ingredient to induce phytotoxicity in container grown citrus and stressed field trees. 1.3g/L active has been safely used for container grown citrus. This corresponds to a rate of 2.2mL/L for formulations of 600g/L phosphorous acid.
The best approach for stressed trees is to apply the lowest of the label rates, judging the need to reapply by inspecting root health after 2 to 4 weeks. Alternatively, the effectiveness of applications can be determined by analysis of phosphite levels in the roots (greater than 30ppm are required) – analytical companies such as SGS provide this service.

Phosphorous acid and copper fungicides
Phosphorous acid application in the presence of copper fungicide residues increases Cu ion release, increasing the risk of copper phytotoxicity – particularly if the pH of the phosphorous acid is not adjusted to >7.2. Risk depends on copper type (in order of decreasing risk): hydroxide > oxychloride> oxide.
Check thoroughly with the phosphorous acid manufacturer before attempting to tank mix with other chemical. As a general rule, phosphorous acid should not be tank mixed with any other fungicides.

Tropical Fruit Discussion / Contacting Member
« on: August 20, 2022, 07:29:13 PM »
I was contacted by a member by PM.
It was a one off looking for Citrus seed.
The member is not too active, few posts, not checking PMs.
Ended up I got some seed, but can't get a PM reply from them.
Any Ideas how to contact via email ??

'Shocking' DNA discovery traces most of the world's macadamias back to one Australian tree
the race is on to preserve wild macadamia trees to improve traits like disease resistance, size and climate adaptability.

Multi stem Avocado rootstock seedlings, Can I strike as cuttings ?
So I have a bunch of rootstock seedlings, mainly Zutano and Reed.
Quite a few are multi stemmed.
Still on the seed, pencil thick or less diameter, 6 months old.
Any thoughts on striking some as detached cuttings ?
Otherwise thought of trying to root them.
Maybe top the pots with sand, or a filled tube over the multi stems to induce roots.
Some version of the clonal Avocado method ?
Anyone heard of or tried this ??

Unlemon - a meandering tale of citrus’ is now showing at the Museum of Economic Botany, Adelaide Botanic Garden.
Plus some other locations.
For those not in Australia, here is a Youtube and FB tour.
I was impressed by the exhibition catalog too.

Architectural development of some citrus trees from seed planting to first blooming.
Interesting study, goes beyond node count theory to describe the flowering structures of a seedling as it matures to flowering.
Some interesting thoughts on the role of grafting to replicate the structures.
English PDF

Tropical Fruit Discussion / Any info on Joachim Avocado ?
« on: May 23, 2022, 04:44:45 PM »
Any info on Joachim Avocado ? When and where did it originate ?

Anyone growing fruiting Citrus amblycarpa ??
I'm wondering if the fruit flavour has any resemblance to Citrus hystrix juice, as according to some descriptions ?
There seem to be a few versions of it available, some say tiny sour mandarin.
Guessing some aren't the real one ??

Citrus General Discussion / Flamingo Red Pummelo..Seedless ??
« on: November 26, 2021, 05:56:39 AM »
"Flamingo" – Red Pomelo is a hybrid of the 'Chandler' pomelo with a hybrid of a Shamouti orange and a clementine.  This pomelo variety ripens in the period from October to December and unlike other varieties it maintains its red color when the temperature drops. The pomelo is sweet (14% sugar) and seedless and its special feature is the presence of lycopene.

Anyone know if these are completely seedless or just "seedless" ??  Just found some fruit for sale.

Citrus General Discussion / Is Shunkokan polyembryonic ???
« on: July 13, 2021, 06:22:54 PM »
Hi, just wondering if Shunkokan is polyembryonic, or otherwise reasonably true from seed ??

Tropical Fruit Discussion / Carmen Hass Avocado
« on: June 25, 2021, 07:31:22 PM »
I am trying to track down Carmen Hass Avocado fruit in Australia.
Anybody have any good pics or tips on telling the fruit of this Hass var from other Hass types.
Any info on seed shape, skin colour, flesh colour or texture compared to other Hass.
Hass are in season over here now.

Just wondering if anyone has ever seen fruit of either Biasong aka small flowered papeda and / or Samuyao aka small fruited papeda?
How do the fruit of either compare with Citrus hystrix/Makrut ? Are they fairly close or quite different? .

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