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Messages - Marcin

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1
Citrus General Discussion / Re: Could it be citrus greening? Europe
« on: October 08, 2022, 05:01:43 PM »
Thank you, Ilya for the information. It's good to know that there have been no reports of the disease in Europe.
1rainman, thanks for the suggestions.

2
Citrus General Discussion / Re: Could it be citrus greening? Europe
« on: October 05, 2022, 04:17:58 PM »
Thanks for the replies. That's true - even if this tree is infected, there are no psyllids in Poland which would fly on distance and infect other plants. If other citrus plants are isolated from that one, they should be safe.

3
Citrus General Discussion / Re: Could it be citrus greening? Europe
« on: October 01, 2022, 02:29:30 PM »
Yes, I know HLB is unlikely in Poland but because it's a market-bought plant, probably imported, then maybe its not impossible. Thank you for the answers.

4
Citrus General Discussion / Could it be citrus greening? Europe
« on: September 30, 2022, 05:23:43 PM »
This problem has been posted recently on Polish citrus group on Facebook. The leaves on this tree started to develop irregular yellowing pattern. The problem started about a month ago. The tree was purchased this spring, it was probably imported from southern Europe.

The question is - could it be citrus greening disease?



5
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: June 06, 2022, 06:32:07 PM »
Till, it would be interesting to produce a hybrid of citrumquat with yuzu. Or maybe it would be even better to produce a hybrid like: (Kumquat x Poncirus) x (Yuzu x Poncirus). Then in theory you could find a seedling with all Poncirus hardiness + additional dormancy and fruit quality traits from kumquat and yuzu.

BorisR, thanks for the info. 2.5 months is super fast ripening for a citrus. It's a pity that this variety is problematic in breeding.

Mikkel, triploids with hindsii parentage can be fertile. So triploidy is a problem in this case but only to some extent. Reale (clementine 'Monreal' x F. hindsii) is triploid and it produces zygotic seeds and marginally viable pollen. The original procimequat is triploid and is known to produce seeds. The procimequat available in Europe might be either triploid or judging on the very thick leaves it might have also higher ploidy level, it produces nucellar seeds and viable pollen.
Yes, there are also other kumquat types that are said to flower fast from seed. Like Meiwa, Fukushu, maybe also others. It would be good to select the earliest flowering specimens among them to use them in breeding.

By the way, I think backcrossing works best when you want to transfer a single gene responsible for some trait. Here there are many genes responsible for frost hardiness, dormancy and fruit quality that we want to combine in one plant. So backcrossing might not be the best option.

6
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: June 04, 2022, 04:46:14 PM »
4 months is fast. It seems an interesting citrus hybrid.

Fortunella hindsii is a good candidate for breeding in my opinon, thanks to its very short juvenile period. Even its small seedlings can fruit. I don't have pure hindsii, also I won't judge on its hardiness, but I've produced some hybrids with hindsii descendants - procimequat and Reale mandarinquat. One seedling Nagami kumquat x Procimequat has already flowered at a low node. So there's hope that the fast flowering trait from hindsii can be passed to the next generations of hybrids.
It would be worth to try combining hindsii genes with Poncirus. I wish you good luck with your plans!

7
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: June 04, 2022, 01:40:34 PM »
BorisR, thanks for the reply. Do you know the ripening time of that ichangquat? Is it shorter than that of kumquat (5-6 months)?

Mikkel, yes in theory with strong selection you can get such a backcross nearly as hardy as the original F1 citrumquat. The question is what is the maximum frost hardiness of these citrumquats? After this winter it's not bad, the two plants had only damaged leaves and a few twigs. But a stronger winter may prove that their hardiness is insufficient for my climate.

8
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: June 02, 2022, 12:42:25 PM »
Mikkel, for my zone 6 climate I'd rather grow F2 generation of these citrumquats. Or try to produce hybrids of these citrumquats with another F1 citrus-Poncirus hybrid. There should be some very hardy plants among big populations.
But for a warmer climate a backcross to kumquat might be good too.

Now I hope that the few following winters will be relatively mild. Then the plants should survive and maybe will flower. No idea whether the fruits will ripen here, but at least pollen should be usable for breeding.

Another possibility is that someone else will obtain fruits of these citrumquats faster, growing them in a warmer zone or in a greenhouse. Then I'd be interested in getting the seeds.

9
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: June 02, 2022, 05:06:25 AM »
It might be due to the rootstock. The plant has been inground since 2018, but it usually freezes in winter and then regrows. Grafting it on Poncirus would be a good idea.

10
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: June 01, 2022, 02:59:21 PM »
The citrumquats have survived winter inground. The lowest temperature was -13/-14 C, or possibly a bit lower. They have been covered with peat, rafia, straw and white cloth. It seems they have inherited the strong dormancy trait from kumquat. They are growing now but with a delay compared to Poncirus.

Amber. New growth is appearing. No bark damage.


Maroon. This is the most vigorous one. New growth is appearing. Also no bark damage.


Carmine. Growing but has some bark damage and significant twig damage.


For comparison citsuma Prague has frozen nearly to the ground level. Only the rootstock and a few centimeters of Prague wood are alive. The rootstock is not pure Poncirus, but a citrange or citrumelo.


11
Citrus General Discussion / Re: Pomelo Kumquat Hybrid
« on: February 03, 2022, 07:58:48 AM »
Reale is a hybrid of 'Monreal' clementine and Fortunella hindsii, developed in Italy. You can find its description in the link:
https://www.researchgate.net/publication/279664587_New_Promising_Citrus_Triploid_Hybrids_Selected_from_Crosses_between_Monoembryonic_Diploid_Female_and_Tetraploid_Male_Parents

Reale is triploid, but when cross-pollinated, it produces seeds.

12
Citrus General Discussion / Re: Pomelo Kumquat Hybrid
« on: February 02, 2022, 05:05:38 AM »
I used limequat as mother plant, and pummelo as father plant.

13
Citrus General Discussion / Re: Pomelo Kumquat Hybrid
« on: January 27, 2022, 05:13:15 PM »
I tried pummelo x Meiwa kumquat. Also pummelo x Reale mandarinquat and Reale x pummelo.

14
Citrus General Discussion / Re: Pomelo Kumquat Hybrid
« on: January 25, 2022, 05:07:02 PM »
I've tried to produce pummelo x kumquat hybrid, but with no success. Maybe it needs to be tried again, or perhaps they're not compatible. For the moment I don't know of any viable hybrid between these two species.

However, I've had success with hybridizing limequat with pummelo. The varieties used are probably Tavares limequat and Tahitian pummelo. That seems a good combination, the resulting seedlings were healthy and vigorous.

15
Sweetie fruits sometimes have seeds. I had grown its seedlings in the past, from my experience they were zygotic and varied a lot. Some were weak, some had acceptable vigor.
Other triploid citrus varieties also can sometimes produce seed. In Persian lime the seeds are said to be rare, but for example Reale hybrid will produce seeds on a regular basis when cross-pollinated. Procimequat also produces seeds despite being triploid (see: https://citrusvariety.ucr.edu/citrus/procimequat.html).

16
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: December 08, 2021, 06:32:41 PM »
Thank you all for the replies.
Till, it will be interesting to track your progress with Kucle x Poncirus hybrids.
Vnomonee, Jibro, I'm prepared that they can be harmed or killed by more severe frost. I've made backup copies of the three most promising plants.
Kumin, I find your breeding work really impressive. Maybe when I obtain fruits from these citrumquats, I'll manage to make a selection project similar to yours, although on a much smaller scale.

17
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: December 07, 2021, 04:13:36 AM »
Frank, sorry for delayed reply. Last winter these hybrids were exposed to only slight frost, like -5 or -6 C, of course with no damage but that doesn't say much. This year I planted them inground, so the winter will be a real test for them.
They have an interesting trait in that the leaves change colors, but not all drop immediately. Some of them can last on the plant through the winter and become mostly green again. The leaves were already reddish in October, and many still hang on the plants now in the beginning of December and keep the color.

End of October:



Yesterday:


18
Citrus General Discussion / Symptom of tristeza virus?
« on: August 24, 2021, 06:46:51 AM »
I've got a lemon plant with such symptoms visible on old leaves. There is some deformation, and when you look against the light, some leaf veins look bright.





Is that vein clearing symptom related to citrus tristeza virus? Or could it be some other problem?

19
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: October 12, 2020, 06:58:25 AM »
Mikkel, unfortunately they were weak and died. It's very rare to get a healthy seedling from Reale.

20
Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: October 11, 2020, 06:43:08 PM »
Nagami x Poncirus seedlings are changing colors.


21
My citrus spent the winter in a dark basement. To give them some light, I installed a simple led flashlight and connected it with solar panel. Every day they received 1-2 hours of white light. Nearly no watering. No heating. The lowest temperature in the basement was about 0 °C, possibly -1 °C. The highest measured was about 6 °C. They spent three months underground.

Most of them did fine, except for the most frost sensitive like citron and lime. Satsumas, kumquats and ichangensis didn't lose a single leaf.



22
Cold Hardy Citrus / Re: N1triVoss
« on: May 03, 2019, 05:33:23 PM »
Usirius, the flowers on your plant look very similar to these of citrangequat 4 saisons.

23
Cold Hardy Citrus / Re: Citrus tachibana
« on: March 21, 2019, 06:14:28 AM »
High grafting on trifoliate is advised by J. Stewart Nagle in Citrus for the Gulf Coast. It is said to reinforce winter dormancy of the entire plant.

24
Citrus General Discussion / Re: Yuzu Fingerlime cross
« on: February 01, 2019, 05:52:08 PM »
PDXIan, how do the first two leaves of this seedling look? Are they round and paired like in most citrus seedlings? Or smaller and unpaired? - that would indicate fingerlime parentage.
http://tropicalfruitforum.com/index.php?topic=26869.0

25
Cold Hardy Citrus / Re: Citsuma Prague
« on: November 24, 2018, 02:26:20 PM »
Prague leaves display an interesting chimeric pattern before dropping. Almost like a variegata ;)

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