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Topics - kumin

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Cold Hardy Citrus / TaiTri vs 5* deciduousness and hardiness
« on: December 13, 2019, 03:47:19 PM »
Is anyone familiar with both TiaTri citrandarin and 5* citrumelo in respect to their winter hardiness? The first indications I see are that TaiTri shows a bit of deciduousness while I see none in the 5* at this point.  Some of my segentrages show appreciable deciduous behavior, others don't. TaiTri also made less late growth. Which has shown better cold resistance?

Citrus General Discussion / 7 on 1 inverted bud grafts
« on: August 29, 2019, 12:22:41 PM »
Here is a photo of a bud graft of 7 individual scions onto 1 Poncirus rootstock. All 7 buds "took", and 4 quickly pushed new growth. A 5th bud began to push in the last week. 2 buds remain dormant at this time. They were budded using inverted T-buds. I had done several hundred T-buds in the past, mostly on Prunus cultivars. These were the first inverted T-buds I did and they did great.

Photos of a simple graft for joining a small diameter scion with a range of similar or larger diameter actively growing rootstocks. These have worked very well for me in the past.

Selected Poncirus rootstock.

Scion donor F2 citrange plant.

Scion severed from donor.

Epidermis shaved off of scion side 1.

Epidermis shaved off of scion side 2.

Shallow downward cut on rootstock - avoid cutting into wood.

Scion ready for insertion. Leaf area has been reduced to 25-30% to reduce transpiration.

Scion fitted for insertion.

Graft wrapped with parafilm.

Completed graft showing flush of growth present at time of grafting.

An example of this type of graft after 18 days. This graft will be re-wrapped until healing is complete.

Cold Hardy Citrus / Root graft transferred cold hardiness effect
« on: May 09, 2019, 01:00:06 PM »
As I'm potting F2 Citrange winter survivors I'm noticing an interesting phenomenon. Due to the large number that were hand planted (20,000 - 21,000) plants, they were planted 4 per hole. Even so, planting took 40 hours to complete.

I've noticed some of the hardy plants have one or more of the companion plants beginning to grow from a low point on the stem. As I attempt to separate them, some are joined by self-grafted roots. It appears the hardy plant has slightly increased the hardiness of the joined companion plant. The stem of the recipient plant has only slightly increased stem hardiness. The effect is noticeable very low on the stem, just above the roots. It appears planting them individually would have prevented this, however 40 hours of hand planting was near my endurance limit.

I suspect there is some correlation between leaf size and stem thickness in seedlings to the fruit size they will produce when they attain maturity. Has anyone found such a link, and if so, how closely were these characteristics linked? Pummelo and citron as well as grapefruit appear to follow this trend.

Cold Hardy Citrus / Citrus seed germination beginning in 6 days
« on: March 01, 2019, 02:15:12 PM »
Here is the first indication of 27 TaiTri seeds beginning to germinate on day 6 inside a repurposed poultry egg incubator. The auxiliary thermostat is set at 86 deg. F., the seeds were disinfected and the seed coats were removed prior to planting. Disinfection and seed coat removal decrease the likelihood of there being albino seedlings.
This setup should use very little energy.

First seed close to emergence

Replacement thermostat used, original thermostat removed. Setpoint 86 deg. F.

Retired incubator repurposed as seed germination mini-chamber.

Roots have also begun development.

Cold Hardy Citrus / F2 citrange winter hardiness trial
« on: January 25, 2019, 08:04:22 AM »
I'm trialing a population of F2 Citrange seedlings this winter in zone 6b in SE PA. There is considerable variability in the resistance to low temperatures, with some dying in November and others still viable at this point. The population is a mixture of nucellar  F1 and zygotic F2 seedlings. The F1 are freezing out at present, but a number of the F2 are surpassing the F1 in hardiness and a few appear to be surviving the winter. My hope is that several will approach the hardiness of P. trifoliata.

Any survivors would then be evaluated for palatability. My focus is centered on hardiness, with palatability being secondary.

I've grown poncirus since 1980 and lost everything above the snowdrifts in Jan of 1994. This was after 2 consecutive nights at -24 F. The trees resprouted below the snow height and haven't been injured since.

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