Author Topic: F2 citrange winter hardiness trial  (Read 50890 times)

Walt

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Re: F2 citrange winter hardiness trial
« Reply #425 on: April 20, 2022, 11:50:24 AM »
Natural selection can be pretty intense. On the average, in the wild, each tree gives only one seedling to reach maturity. 
Otherwise the number of trees would keep increasing.
But in the wild, many of the seedlings die by being eaten by insects and bigger animals, not for lack of adaption.  Of course, in Kumin's program, dangers other than cold were eliminated.  So all the selection was limited to cold survival.  That's what breeders do.

kumin

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Re: F2 citrange winter hardiness trial
« Reply #426 on: April 24, 2022, 06:15:44 PM »
A few updates since we have had low temperatures of 26F. Some of the trees are planted in the lowest location of the property and suffered frozen newly emerged buds.

# 010 frozen buds at ground level, no damage higher on the plant.




#011 damage only at the lowest locations, hardiness essentially identical to #010.



#001 very little damage.



4 year old #128 no damage on own roots, slightly higher elevation (20"-24" higher). The majority of the survivors in the original test plot were severely damaged during the past Winter. This tree shows not damage and is clearly hardier that the others.




Poncirus in full bloom, higher elevation, no damage.

The most important determining factor appears to be elevation, in previous years Poncirus showed damage of about the same degree as the hybrids, determined by elevation on clear,  wind free nights.
« Last Edit: April 26, 2022, 06:50:21 PM by kumin »

kumin

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Re: F2 citrange winter hardiness trial
« Reply #427 on: May 01, 2022, 06:03:13 PM »


4 year old Segentrange showing a number of post bloom fruitlets. This tree produced 2 June bloom fruits last year.  Unfortunately, the seeds appear to be nucellar.
« Last Edit: May 02, 2022, 04:49:42 AM by kumin »

Jibro

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Re: F2 citrange winter hardiness trial
« Reply #428 on: May 05, 2022, 05:32:47 AM »
Nice fruits, looks like the flower buds are the same type as on Poncirus, did you try flowers if they are fragrant or without smell as Poncirus flowers?
Fruitless are also hairy like Poncirus, let's hope they will have somehow better taste  :) I am looking forward to your next information... 

kumin

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Re: F2 citrange winter hardiness trial
« Reply #429 on: May 05, 2022, 12:02:27 PM »
Jibro, you're correct, these flowers bloom from Poncirus type fruit buds that develop in the previous Summer. None of these flowers are fragrant. A-026 fruit are subtilty sweet. Two of the Segentranges that haven't flowered yet have fragrant leaves, hopefully their flowers will also be fragrant.

By undergoing extreme selection for cold hardiness, it can be expected the survivors will be skewed towards Poncirus genetically.
« Last Edit: May 07, 2022, 05:16:51 AM by kumin »

kumin

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Re: F2 citrange winter hardiness trial
« Reply #430 on: May 16, 2022, 07:19:25 PM »
Another 5* Citrumelo tree is in bloom at 37 months of age. Most of these flowers are staminate, but are loaded with pollen.


The outdoor, high grafted on Poncirus, 5* was injured by repeated lows of +5F. temperatures. 5* is a vigorous grower and should recover nicely.


TaiTri finally appears to be a bit hardier than 5* Citrumelo.

« Last Edit: May 16, 2022, 07:21:47 PM by kumin »

kumin

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Re: F2 citrange winter hardiness trial
« Reply #431 on: June 20, 2022, 07:50:50 PM »

Conestoga A-026 fruit have set quite reliably. The size likely won't exceed the size of Poncirus. These fruits were self-pollinated, as they appear to produce nucellar embryos.

A large number of Poncirus flowers were pollinated with Meyer lemon pollen. The setting percentage was excellent.

Meyer lemon fruits pollinated with Poncirus+ and 5* Citrumelo pollen. All the seedlings should be hybrids.
« Last Edit: June 20, 2022, 08:16:09 PM by kumin »

Ilya11

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Re: F2 citrange winter hardiness trial
« Reply #432 on: June 21, 2022, 03:05:08 AM »
Meyer lemon fruits pollinated with Poncirus+ and 5* Citrumelo pollen. All the seedlings should be hybrids.
From my experience Meyer's flowers should be castrated very early since it shedding pollen well before flower bud opening.
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                       Ilya

kumin

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Re: F2 citrange winter hardiness trial
« Reply #433 on: June 21, 2022, 04:19:02 AM »
Ilya, I also noticed Meyer releasing pollen before the petals opened. To prevent self pollination the petals were opened with tweezers and the anthers were extracted a day or two before the petals opened naturally. The pistils didn't appear to be receptive when the anthers were removed, so the pollination was repeated 2-3 times over the following days.
« Last Edit: June 21, 2022, 04:22:32 AM by kumin »

Ilya11

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Re: F2 citrange winter hardiness trial
« Reply #434 on: June 21, 2022, 10:31:35 AM »
Kumin,
Do you have an experience with Meyer hardiness?
 In US it is considered more hardy than regular lemons, but strangely enough, when I tested several Meyer clones available here in Europe, they all turned out to be  less resistant than Eureka.
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                       Ilya

kumin

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Re: F2 citrange winter hardiness trial
« Reply #435 on: June 21, 2022, 03:18:28 PM »
I have 2 Meyer seedlings in the cold frame as a control comparison against my other hybrids. At 20F (-6.6C) in the 2020/2021 Winter there was no damage. During the immediate past Winter (2021/2022) at 15F (-9C) they were severely damaged and haven't recovered yet. We have the issue of repeated low temperatures, unlike the Southern US, which tends to have shorter intervals of cold weather. 
All of my Poncirus hybrids are more cold resistant than Meyer lemon.
« Last Edit: June 21, 2022, 03:22:13 PM by kumin »

 

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