For me Christmas / New Year. It is still outdoors, but protected by the sail.

I wanted so much to have seeds in the fruit. That's why I polished all of them. I did not care about nature. Unfortunately, no seeds.

I wanted to see the seeds and wanted to plant them. Just like Sylvian did.

In my opinion, this is the only way to get answers to some questions about the plant without the use of specialized workplaces and laboratories.

"I am not aware of specific fungicides to treat citrus Greasy spot disease"

Maybe misunderstood or poorly translated.
It may not be specific, but must be available on the market. Other climate, other cultivated crops, other demand for fungicides.
In the Czech Republic :
1. Each fungicide must be registered and tested. Registration is for a high fee and is only valid for a limited time. If it is little sold, the manufacturer will not renew the registration and the product will stop selling.
2. Part of fungicides may be sold freely, part only to holders of permits for the handling of dangerous or environmentally damaging substances. Getting this privilege requires the appropriate education, passing the exam and of course paying the fee. Normal people who do not live with farming do not have this right.
What is not specific to you may be specific to me (if I can not buy it in the store, it's specific to me  )


"Treatment for greasy spot fungus is easy enough. The best treatment around is to use one of the copper fungicides out there and spray the tree with it. Use the copper fungicide according to directions in order to kill the citrus tree fungus."

Hmmm. There is nothing more to say. Just : Come and show how easy it is! None of the fee available fungicides in the Czech Republic against the Greasy spot does not work. This is not just my experience, they are also in the big garden with citruses (ADAVO, https: //eshop.rakytnik.com/katalog/zbozi/citrusy, I think you know it) and many others. Of all free available fungicides, the Greasy spot will limit only one. It is based on copper - the active substance is copper oxidchlorid. It only reduces but nothing more.
In the category of fungicides sold only to holders of the authorization are fungicides, where they really apply then: Treatment for greasy spot fungus is easy enough.
Ilya, it's my personal experience, not that somewhere he said, somewhere he wrote.

Yes I know, I read everything. Otherwise I would not know that there are some visible photos without registration 
Ilya, without photos, just from the text, I do not know if she really talks about the same disease as my Meyer's or about Greasy spot or something else.
On public visible photos is not diseas, is not Greasy spot. Some contributions describe it in the winter - it's not the same disease. That fungicides do not work is also not a clue because the fungicides available to Greasy spot do not work. I mean available fungicides in the Czech Republic. In Russia it will be the same. Why? Because nobody sells them, because they have only a minimal outlet for them. Because there is another climate and such diseases are not commonly found here.
The only thing I can buy against Geasy spot. It are fungicides on base copper oxychloride. It will not cure Greasy spot, it will only temporarily restrict it. But neither of these do not have any effect on my Meyer's disease.

SoCal2warm  : Is it possible to verify it? If so, how? I'll try to get it.

This applies to all suggestions that it could explain the

„Hybrid (Unshiu x P. ITSZ Prague“ is the greatest mystery among citruses for me.
Is it a hybrid? Is that a chimera? Or maybe something else? Any mysterious play of nature? I do not know.
Many of the previously published information I have discovered. Here I will try to summarize the most important thing about this cultivar I know.


1981:
I started growing citrus

1987:
The first literary reference to the hybrid. "Citrus Growing", c. SZN 1987, Ing. Stanislav Husak, CSc., Doc.Ing. Vladimír Táborský, CSc., Prof. Ing. Pavel Valíček, DrSc., Page 21 - 2.2. Fundamentals of genetics and citrus breeding. Photo 45: "Hybrid (Unshiu X Poncirus trifoliata) bred on ITSZ Praha".
It must be said that this was the first and at the same time the last mention of this hybrid in literature in the Czech Republic.
Note: : Prague is the capital of the Czech Republic. ITSZ is a university. Her name is the institute of tropical and sub-tropical agriculture.
Previously, many books on citrus growing have been published in the Czech Republic. Until 1993, a magazine on citrus growing was published- 5 times a year. The Citrus Growers' Association had 10,000 members (the population of the Czech Republic is 10,000,000 people !!!). In a country where citrus trees can not normally be grown !!
Why it was not published anywhere else is a mystery to me.

1989-1996:
I have seen hybrids several times but Cold Hardy citruses were outside my area of interest. I also met with many interesting hybrids, mostly from the former USSR.
I've heard it repeatedly : Badly growing. It does not produce. If you want the weeds in the greenhouse, grab a bud.

2004: Mr. Zdeněk Černoch began to make his collection of citruses, which now belongs to one of the largest in Central Europe. Especially cold hardy citruses. Aroused great interest in them in the Czech Republic.

2007:
I was also interested for cold hardy citrus. The source of grafts was mainly Broža Petr and Zdeněk Černoch. The Bud from which my plants originated was taken by Peter Broža. From its small 15cm large plants growing in the middle greenhouse.

2009/2010:
Plants at Petr Broža and Zdeněk Černoch died in the winter. They have recovered from me. All plants sold by Zdeněk Černoch all over Europe from 2010 until 2014(?) they're out of my buds. Sometimes later, Zdeněk Černoch brought the other buds from France. I do not know from whom.

2016:
I managed to contact Prof. Ing. Pavel Valíček, DrSc., Author of the book from 1986.
He told me that the hybrid was bred prof. Pospíšil. Classical crossbreeding and subsequent selection. Sometime between 1971 and 1977.

Prof. Pospisil is unfortunately dead.

My friend in Prague visited Mrs. Rozinková, who was a collaborator of prof. Pospíšil. She's an older lady, no new information more. She just confirmed the information from Mr. Valíček. The new information was just that there were also experiments with seed irradiation and any others

From information from Petr Broža I know that B. Voss was wearing some citrus from ITSZ greenhouses in Prague. Whole plant with roots. It was supposed to be the hybrid Uhshiu X P.T. ITSZ Praha. It is certain that many other similar hybrids originating in the former USSR were in the ITSZ greenhouses at that time.

Information from Mr. Hlaváč (Head of ITSZ Greenhouses in Prague) - He confirmed that B. Voss took some citrus plant from the greenhouse. It was not a hybrid but something else. The original plant is still growing in the greenhouse of ITSZ Praha. If I want to, I can come and see.
Meanwhile, I did not have time for this (greenhouses are not publicly accessible, the visit needs to be arranged in advance).

In 2016, I accidentally managed to provide at MU Brno (Masaryk University, the Faculty of Natural Science) a cytometric analysis of the genome size of the hybrid. Incl. comparison of genome size Unshiu and P.T and F.D.
The analysis was repeated three times using different parts of the hybrid tissue. For all samples, only one peak was found in the histogram. This means that the plant has only one genome, ie. the plant is of hybrid origin. The chimera should have two peaks in the histogram because it carries two different genomes. Separately tested parents of the hybrid have the genome size significantly different, the histogram would be clearly visible.
However, cytometric analysis of the genome size can not be, for many reasons,  a 100% result.
---------------------------------------------

For different growers, the hybrid is completely different.

The Sylivian plant grows almost up. My plant a willow. Without counting the height of rootstock, they are approximately the same size. I have to constantly shape the plant. Otherwise, it would look like the second and third my plant that crawls 40cm above the ground.

My and other known breeding plants are free of seeds. Sylvian seed produces.

For me, Bi- and Tri-foliate leaves fall in autumn only in older plants, not in young ones.

Sylvian plant blooms in spring twice, my only once.

My plants show mild symptoms of psoriasis or leprosy. But psorosis or leprosy is definitely not.

At Sylvian seedlings produce non-trifoliated plants. I wanted to verify this very much. Except for natural pollination, all the flowers were artificially pollinated. No seeds. Not a germ.

The plant in Vienna transforms itself into a pure trifoliate.



It is totally crazy.

Ilya, I do not know whether you are placing the Czech Republic in Eastern or Central Europe, but here is what you write no one knows. I do not think of myself, but also of other growers who are my friends. (you probably know - Petr Broza, Zdeněk Černoch and many others). Besides, I am the moderator of a Czech forum devoted to citrus growing. "Meyer's disease" I hear really for the first time. Meyer has a number of various problems in Eastern Europe, but this is new, quite different. For me totally unknown.

But I do not know it does not mean it does not exist!!


Symptoms on my Meyer (EU-Czech Republic) are similar of matt_citrus (USA, Los Angeles) and Mtlgirl (Canada).

I have been growing citrus since 1981. My oldest Meyer is from 1984. I have 4 diffrent Meyer plants. Until 2010 they were all without disease. Since 2010, all of my Meyers have been reported to be ill.
Appears exclusively in the second half of summer. Is only on old leaves, never on new additions. It does not spread to other varieties of citrus.
Plants only significantly weaken, but will not die.
Testing fungicides had no effect at all.

At the same time, it must be said that effective fungicides are forbidden in the European Union. Or they are subject to strict regulation. For normal humans they are inaccessible. You know that.
I managed to get a bit of a highly efficient fugicide subject to regulation. I will try it this year. It is (cyproconazole 160 g / l + trifloxystrobin 375 g / l).

This "Meyer disease" belongs together with the hybrid (unshiu x P.T.) ITSZ Prague among my two biggest mysteries about citrus.

I still think it's some kind of fungus.
Here's the photo in high resolution

Hybrid "Unshiu x P.trifoliata" ITSZ Prague ( true - no "Chimere No.19" )

6 fruits is riped. The fruits are small (19-30mm). Unfortunately, it is not early. And that's a big problem (at Cold Hardy Citrus).

The plant bloomed outdoors and was more intensely pollinated with pollen from other citruses. All the fruits were seedless. Even without hints of germs.
Like somewhat worse satsumas, less stable.

What is applicable in citrus production areas does not have to and does not apply elsewhere (in Canada .... or the Czech Republic). Other combinations than Poncirus Trifoliata (or Citrumelo: I in the case of highly experienced growers - Citranges) and very cold wintering of citruses do not lead to a good result. Often even no results.

My practical experience differs in many ways from what I can read elsewhere. And it's not just the US119.
For US119, it is primarily about frost resistance data. It is significantly higher. And these are all my citruses grown in pots.

Only Czech language : http://www.citrusy.estranky.cz/fotoalbum/mrazuodolne-hybridy/hybr_-usa119/

Cold Hardy citruses are graftet all on Poncirus trifoliata.
For other citruses I use predominantly poncirus or citrumelo Swingle. Few plants are on citranges.