Showing posts with label Pembina. Show all posts
Showing posts with label Pembina. Show all posts

Sunday, November 29, 2015

Orchard changes and plans. 11.29.15

During the cold winter season, there is more time to ponder what I will do next year.  I gave up on 2 peaches - Indian Free - no peach in about 8 years of growing it, and Oregon Curl Free - probably 75% killed by canker.  I don't want it to be a reservoir of disease for others.  If it's only going to bear one year then succumb to disease, why bother?  It could be the rootstock.  Citation seems to be canker-prone.  Peaches are hard to graft, or I might have tried to salvage some scion.  Removing them now will give me a change to clean up the locations.

Current thoughts, subject to change.  Photos are just old illustrations, not meant to depict these varieties.

Image via vintageprintable.com
Apples.    Links are to descriptions, I haven't decided on sources yet.
Add one tree, Winecrisp.  Starks states, "Disease-resistant to scab, fire blight, and powdery mildew. Stores up to nine months."  A PRI co-op disease resistant variety.  Orange Pippin states very good flavor.  Science Daily fluff article in 2009 states "More than 20 years in the making".
Add some grafts.  None of these are patented.  "I've given priority for disease resistance and complex flavors, but also some historic types.  Growing them might be the only way I ever taste them.
Sweet-16.  From University of Minnesota, a source of many good varieties including Honeycrisp, SweeTango®, and Zestar®.  "Crisp and juicy with an exotic yellow flesh and a very sweet, unusual sugar cane or spicy cherry candy flavor. The fruit stores for 5 to 8 weeks. Tree is very vigorous and fruit may be subject to premature drops. Introduced in 1977."  Various websites state Sweet-16 has spicy flavor notes and is vigorous and disease resistant.
Image via vintageprintable.com
GoldRush.   Another PRI co-op apple.  Disease resistant, vigorous, long keeper.   GoldRush was designated by the State of Illinois as the state apple - good marketing my University of Illinois.  A low-ethylene producer, which helps in longer storage.
Baldwin - a very, very old heritage variety, not much grown now.  Triploid, like Jonagold, so needs a pollinizer but can't serve as one.  Not a problem on multigraft.  Origin in the late 1700s - Wikipedia states around 1740, no special disease resistance, I just want a taste of the past.  Spur bearing.  Exceptionally good pie apple.
Newtown Pippin.   Another very, very old variety.  Grown by Thomas Jefferson, George Washington, and Benjamin Franklin.  Origin in late 1700s.   Spur bearing.  Most of the NY harvest goes to Martinelli's sparkling cider.   I tasted some locally grown Newtown Pippins, made a pie, it was very good.  Mostly it's the idea of a more-than-200-year-old variety.    Nothing notable as far as disease resistance.
Milo Gibson - a hobbyist apple  Reported as "licorice flavored with hints of banana" .  Not much info on this one but the flavor sounds interesting.

Image via vintageprintable.com
Euro Plums.   I will use scion for grafting, not adding new trees.
Mt. Royal.  Self pollinating, heavy producer.  Developed in Quebec prior to 1903, so a heritage variety.  I want to replace most of my unidentified plum with something that produces and tastes better.  I can overgraft it with these.
Seneca.   Large Red Plums, from NY Exp station 1972.  Reportedly good for Pacific NW. 

Hybrid, Asian/American Plums.  These are some notes I had written down, but some info summarize here.  Primarily for multigrafts.  A couple of new trees, on Hollywood / cerasifera / myrobalan root stock I have already grown.
Pembina.  Hansen, 1923.  Dark red plum, yellow flesh, juicy sweet heavy yield. 
Superior - large golden plum that blushes pink.
Waneta - Yellow blushed, red fruit.  Hansen, 1913.
Pipestone.  Prunus salicina X Prunus americana "Wolf".  U. Minn 1942.  Needs pollinator. 

 I need something else to obsess over.  I've driven these plans into the ground.


Saturday, October 31, 2015

Plum Pollination. 10.27.15

Among the more challenging aspects of growing Asian and Hybrid plums is pollination.  Some varieties self pollinate, many require a different plum variety.    Different websites have different information.  In different areas, rules that apply in one area might also not apply in another, due to differences in temperature or bloom time.  Sometimes, you just plant a tree or trees and hope for the best.

The nursery sites are not always accurate, or don't necessarily give the wanted information.  The source of the information is not usually given.

Raintree.com - my source for Shiro and Hollywood.  These 2 seem to pollinate each other.  Shiro is described as partially self pollinating, and Hollywood is described as self pollinating.  They bear well in my Vancouver yard, without other visible plum trees in the neighborhood.

Hybrids can indicate any species with another species, but usually refers to Asian species hybridized with native American species.  Asian species give larger size and more meaty flesh, American species add to the flavors and give much better cold compatibility.  Many of the hybrids are about 100 years old, so are nonpantented, and do not have industry or university sponsors or advocates.

University of Minnesota Ag Experiment Station workers did a detailed project regarding hybrid plum pollination  in 1950.   Among their tables, abstracted below.  I summarized only the varieties that I have seen for sale as trees or scion, various sources.

Prunus simonii

From Table 3.   Hybrid and native plums rated as good pollinizers.
Kaga.  P. americana.  12 recipient varieties tested.  Early bloom.
Toka.  P. american X P. simonii.  22 recipients tested.  Early bloom.
South Dakota.  P. americana or P. americana hybrid.  27 recipients tested.  Medium late bloom


From Table 4.  Hybrid and native plums rated as fair pollinizers.
Ember.   P. salicina hybrid X P. americana.  24 recipient varieties tested.  Bloom season, mid.
Hanska.    P. americana X P. simonii.  17 recipients tested.  Early.
Superior.  P. salicina X (P. americana X P. simonii). 18 recipients tested.  Early / mid.
Shiro.  P. salicina hybrid.  1 recipient tested.




From Table 5.  Pollinizers tested and rated as poor.
Prunus salicina "Shiro"
La Crescent.
Pembina.
Underwood,
Waneta.
Tecumsah.

Other comments from the  1950 U Minn paper -

The study began in 1932, and extended for a number of years.

It was noted that native plums had good pollen viability, while hybrids had generally poor pollen viability.   Some had 50% with aborted pollen grains.  Many of the hybrids produced pollen with empty or aborted pollen grains.  Toka was shown to have good viability but a poor pollinizer.  However, in the tables Toka is listed as a fair pollinizer.

Lack of fruit production may be defective pollen, low viability of pollen, or pollen incompatibility.

Among hybrids, more of those with female American plum parent, were good pollinizers. P. simonii may also contribute something to hybrids, in terms of being good pollinizers.

The authors also note that many of the hybrids resemble mainly their female parent.  They go on to say that  this may be due to apomixis, reproduction without sexual fertilization.

So you might think you have a hybrid, based on pollination, when reality the variety is selfed.

Rutland Plumcot.
From Table 8.  Compatibility. Recipient named first, pollen sources follow.  P=poor, F=fair, G=good.

Ember.  Hanska (G), Kaga (F), Superior (G), Toka (G), S. Dakota (G), not self.
Hanska.  Ember (G), Superior (F), Toka (G), not self
La Crescent.  Ember (P), Hanska (P), S. Dakota (G), Toka (G), self not mentioned
S. Dakota.  Ember (F), Hanska (G), Superior (F), Toka (G), not self
Superior.  Ember (P), Hanska (G), Kaga (G), Superior (G), Toka (G), does pollinize self.
Toka.  Kaga (G), Superior (G), not self.
Underwood.  Ember (P), Hanska (F), Kaga (G), Superior (F), Toka (G), self not mentioned.
Waneta.  Ember (G), Hanska (G), Kaga (G), Superior (F), Toka (G), self not mentioned.

This seems to disagree with other reports of Toka pollinizing self.

Finally, there is also an issue of bloom season.
Prunus cerasifera

From Table 8.  Varieties of plums suggested...

Early bloom season - Superior, Toka.
Mid bloom season - Ember, Underwood.
Mid to late - South Dakota.

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Info from TheFarNorthGarden.com website:
"P. salicina hybrids were developed by crossing native wild plums with plum varieties from California that were not hardy, producing hardy trees with good quality fruit. These include 'Pembina' (sometimes called 'Prairie', 'Acme' or 'Elite'), 'Patterson Pride', 'Brookred', 'Geddes' and 'Perfection' (sometimes known as 'Superb'). These hybrids will only produce fruit if they are pollinated by a wild plum, and they do not provide pollination for any type of plum, including each other. This may explain why some growers have poor fruit production with these trees."

Another lesson - plums of the same variety can have different names.

From "Plums on the Prairies" - by Rick Sawatzky, University of Saskatchewan
On terminology - " Pollinators , usually insects, are vectors of pollen movement. Pollinizers are plants which provide the appropriate pollen for other plants"

On Pollinizing - " George F. Chipman who edited the Prairie Gardener for many years and who wrote about plum pollination in 1934. He summarized a study done by Prof. W. H. Alderman at the University of Minnesota by saying, “...very few hybrid plums would accept pollen freely from other hybrids, but they would all accept pollen from native plums”. 

A precaution comes to mind -  not from a specific source, but from my observation - most of these studies and comments regard plums grown in the Midwest, and usually the North Midwest at that.  There, the climate is not friendly to most Asian plums, which is why they are interbred with American species.  Therefore, the pollen from Asian plum varieties might not be tested on the hybrids.  Both Toka and La Crescent have Shiro as a parent, so Shiro might pollinize those varieties.


From LMtreefarm -
Brookgold - Asian plum
Brookred- Asian plum
Greenville  - Asian (Burbank) by P. nigra
Patterson's Pride - P. nigra X Asian plum, 1960
La Crescent - Howard Yellow apricot X Shiro Asian plum 1923
Pembina - Native Canadian plum X Asian plum "Red June"
South Dakota - pollinator for hybrid plums, a selection of Prunus americana.  1949
Tecumseh - Shiro X "Surprise" -
Toka - Native plum X Chinese plumcot P. simonii.  1911.

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Toka plum

HardyFruitTrees states La Crescent is "Also known as 'Crescent', 'Golden La Crescent' and 'Golden Minnesota'. La Crescent is a cross between the 'Shiro' plum (Prunus simonii x Prunus salicina x Prunus cerasifera x Prunus munsoniana) and 'Howard Yellow' plum ( Prunus americana). It was introduced in 1923 by the University of Minnesota Fruit Breeding Farm"

The source has some nice things to say about La Crescent - "sweet and juicy...golden-orange color...flesh is yellow like an apricot... melting and not fibrous... freestone... taste has an hint of apricot. and they note that it is a poor bearer and must be pollinized by and American or Canadian plum.

Of Pemina, they state - "hybrid between a Japanese plum (Prunus salicina) and a Canadian plum (Prunus nigra)... self-sterile... must be pollinated by a wild plum tree, or a pure American plum tree (Prunus americana), or a pure Canadian plum (Prunus nigra)....introduced in 1923 by Niels Ebbesen Hansen from the South Dakota Experimental Station in Brookings"

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Based on all of this information -

-Of readily available varieties to pollinize Hybrid plums, Toka seems to be the best candidate.
-South Dakota seems equally good as a pollinizer, but is harder to find.
-It's not clear to me that Asian plums have been tested as pollinizers for hybrid plums.  It's worth adding them into the mix in this area.
-If a pure American or Canadian plum can be found, those are considered among the best pollinizers for hybrid plums.
-Probably, the more types in the mix, the better the chances for a good crop.  If there is not room for multiple plum trees, or ability to are for multiple plum trees, multigraft is an option.

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Images are public domain via U.S. Department of Agriculture Pomological Watercolor Collection. Rare and Special Collections, National Agricultural Library, Beltsville, MD 20705.  " The majority of the paintings were created between 1894 and 1916."