Where did the information that Warren can act as a pollinator come from? That’s news to me. I’ve grown Warren for 40+years. My original scions came from T. O. Warren who was my mentor when I lived in MS. We always thought it to be pollen sterile like Magness.
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Warren has always been able to pollinate others and magness has always been unable to do that. Any nursery will confirm it eg. Warren Pear – Trees of Antiquity
" The Warren pear tree was named for Thomas O. Warren, a founding father of the North American Fruit Explorers (NAFEX), who discovered this gem in Mississippi, in 1976. The Warren pear is medium to large, long-necked, drop-shaped fruit is faded green with an occasional red blush in full sun. That said, the Warren pears can vary in size and shape. The pears are rated equal to Magness by many. The Warren pears are sweet, spicy and very juicy, buttery, silky flesh with no grit. Pyramidal tree shape. Fire blight resistant. One of the best for providing a source of pollen to other European pear trees. Please refer below for more information on the Warren pear trees for sale.
Considerations for Warren Pear Tree
USDA Zones: 4, 5, 6, 7, 8, 9, 10
Uses: Fresh Eating
Harvest Period: Very Late
Low Chill: Yes
Bloom Period: Midseason
Pollination Requirement: Self-Fertile
Origin Date: Mississippi 1976
Storage: 3 Months or More
Disease Resistance: Excellent
Rootstock: OHxF 333
Recommended Spacing: 12-16 ft.
Mature Size: 12-16 ft.
Water Requirements: 12-15 gallons per week May through Sept."
It does best with Karls Favorite or another warren close by in my experience. There will be about 30-50% of flowers that wont develop fruit in my experience.
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Agree. All I have read is that Warren’s and Magness’ pollen is sterile.
I look forward to seeing a proof from trustworthy sources that said otherwise.
.
@Fusion_power is working on pollination requirements chart currently. Many charts and universities will confirm warren is self fertile and has fertile pollen. Magness does not. Here is a chart something like im envisioning we will use long term from burntridge.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.burntridgenursery.com/text/Europearpollinationchart.pdf&ved=2ahUKEwjWqfqIpv_-AhVzmWoFHfHgAEAQFnoECC8QAQ&usg=AOvVaw0B6BdAQ5EbgtBA_EX1ANJD
@mamuang @mayhaw9999 notice the chart they mark warren as pollen sterile. I dont believe thats completely true. It might be more difficult to understand, but it is not sterile. It is self pollinating.
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The older pears like warren and potomac get the better they taste.
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Was talking to @Fusion_power about giant seckle and comice being used to develop warren and magness. Giant seckle is one of the many seckle seedlings. Here is a thread on the giant seckle Giant seckle
"
The magnificent Warren pear
BY DAVID KARP
NOV. 25, 2011 12 AM PT
SPECIAL TO THE LOS ANGELES TIMES
With the partial exception of Bartletts, great locally grown pears are scarce at farmers markets in Southern California, where warm winters and disease render cultivation problematic. This makes it all the more special that Al Courchesne of Frog Hollow Farm, a rock star organic fruit grower from Brentwood, Calif., an hour east of San Francisco, will make a cameo appearance the next two Wednesdays at the Santa Monica farmers market to sell his legendary Warren pears.
Arguably the most delicious pear variety in the world, praised by the likes of Alice Waters, Martha Stewart Living and Oprah Winfrey, the Warren combines the best features of its ancestors, with the intensely sweet, rich, spicy flavor of Seckel, and the larger size and voluptuous juiciness of Comice. And the mystery of its origins, heretofore never fully unraveled, is almost as delicious as its flavor.
The trail that leads to the Warren starts with fire blight, a bacterial disease that makes growing most pears virtually impossible in areas where warm spring rains are common; a winter chill is also required, which is why very few European pears are cultivated in the southern half of California.
Historically, one of the few pears of quality that was resistant to blight was the Seckel, tiny but superbly flavored, and discovered near Philadelphia around 1760. Were it not for its diminutive size, it would doubtless be the preeminent pear on the market today.
Starting before 1900, pear breeders sought to hybridize the disease resistance of the Seckel into larger-fruited varieties. In 1920, Merton B. Waite, a U.S. Department of Agriculture breeder in Maryland, came up with a seedling of the Seckel called the Giant Seckel that bore much larger fruit, and was still blight-resistant. But it was not quite as flavorful, and it never became widely grown.
Breeders working for the USDA in the mid-20th century crossed the Giant Seckel and the Comice and in 1960 released Magness, which was blight-resistant and unequaled in flavor. It was fairly widely planted at first, but it soon proved to be an erratic producer and mostly disappeared from cultivation in subsequent decades.
A curiously similar variety named the Warren was discovered by a highly respected amateur fruit grower, Thomas O. Warren, in a most unlikely locale, Hattiesburg, Miss., about 1976. In the first published description of his namesake pear, a short article that appeared in Pomona magazine in 1986, Warren wrote that he found the original tree “growing in the backyard of a friend.” Its ancestry at first was unknown.
He shared bud wood with fellow enthusiasts in the North American Fruit Explorers organization. Another story, meanwhile, circulated that he had “found it planted in front of a post office and USDA soil conservation service office.” However, according to Ram Fishman, a nurseryman and fruit connoisseur who wrote an excellent online essay about Magness and Warren pears, when questioned further about the variety, Warren allowed that he discovered it among “the remains of a test site used by Mississippi State University.” Aha!
Some seedlings from the cross from which the Magness was selected were sent to a branch station in Meridian, Miss., that has long since closed, according to Kearneysville, W. Va.-based Richard Bell, the current pear breeder for the USDA. It is likely that this station sent some of the seedlings, or grafted trees, to Mississippi State for testing, and that the experimental orchard had been abandoned by the 1970s. The hot, humid conditions in the Deep South are murder on pear trees, most of which would have succumbed to fire blight, especially if unsprayed. A resistant tree would have been extremely conspicuous; if a pear tree could survive untended in Mississippi, it could make it anywhere.
Warren, who died last year at age 96, may have been concerned in the years just after his discovery that someone at the USDA would be miffed that he had filched their experimental variety, and so devised a story about finding it in a friend’s backyard. Today, no one would care about the pedigree of a relatively obscure pear, were it not that it is so supremely delicious and that it is one of the very few varieties that can be grown in blight-prone areas such as the Deep South and parts of California, particularly by home gardeners disinclined to spray.
As word of the prodigy spread, many observers noted that the Warren seemed very similar to the Magness; some maintained that they were identical. But there are slight differences: The Warren is more elongated, can have a richer ground color and red blush, and it is more resistant to fire blight. Also, according to Bell, unpublished analyses of enzymes of the two varieties by scientists at Oregon State University showed that they were very close but differed slightly, results consistent with the theory that they originated from different seeds of the same cross, of the Giant Seckel and the Comice.
Because pear trees take five years or more to come into bearing, growers historically have not been very adventurous in planting new varieties, and so the Warren, with its unofficial provenance, has never made a big splash commercially. Pollination is tricky. Frog Hollow Farm’s Courchesne — who has 9 acres of Warren and half an acre of Magness pears, planted from 1994 to 2003 — has to use a special blower to apply pollen to his flowers to get a decent crop.
But he loves the Warren. “It’s got smooth, grit-free texture and an intense, complex flavor, with hints of guava, pineapple and honey,” he says. After taking their own sweet time coming into bearing, his trees produced a bumper crop this year, and so he looked beyond his usual domains at the San Francisco Ferry Plaza and Berkeley farmers markets, to establish a beachhead in Southern California.
The manager of the Santa Monica markets, Laura Avery, invited Courchesne to sell on Nov. 30 and Dec. 7. He will have Warren, Magness and Golden Russet Bosc pears, for $3.90 a pound, along with high-quality dried Flavor King pluots and Fantasia nectarines, and excellent jams made by his wife, Becky. The Warrens are also available at Farmshop, at the Brentwood Country Mart in Santa Monica, and through December by mail order: six fruits, about 3 pounds, for $24, plus $12.50 shipping; or 12 fruits for $35, plus $17.50 shipping. They’re great in tarts and pies, and poached."
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I tasted a good Comice, Warren and Magness all the same year when sampling pears. I have a standard size seckle but have never tried it. I would say their taste profile is off. They claim guava, pineapple and honey. Honey maybe but I would describe the ones from Frog Hallow and I forget the gift basket place that sells Comice but it is something like Harry and something as a brown sugar taste. Basically so intense that it tastes like brown sugar and makes your standard Bartlett and Anjou pear taste like trash in my opinion. I am hoping my Ayers and Seckle are the same way. I tried Comice from a local selling place and they did not taste nearly as good. They were selling the Comice pears in August and September though so I wonder how ripe they were. I think Raintree states their ripeness to be something like October so that is why I wonder if my local store’s Comice sucks. Either way I took out both of my Comice at this point. One was blatantly dead and one has severe die back end of last winter. I will need to figure out how frog hallow got their pears that sweet if you have any suggestions. I have Seckle, Ayers, Warren and Magness which have all been describes as sweet so it is just learning how to take their sweetness to the max.
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The secret of frog hollow farm is that they are in California, which has perfect pear growing weather. Oregon, where Harry & David is have excellent conditions as well. It is like some Colorado or Georgia peaches can not be beat.
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So basically there is no way to actually match those pears in growing conditions then. The article makes it sound like CA is hard to grow pears. The Comice pears I tried were CO grown so you would think we would have conditions similar to CA though?
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There are pockets very good and growing certain crops https://foodsmartcolorado.colostate.edu/colorado-peaches/#:~:text=The%20prime%20locations%20for%20peach,of%20peaches%2C%20freestone%20and%20clingstone.
" * Colorado ranks 6th in peach production in the U.S. There are over 2,400 acres of peach orchards.
- The prime locations for peach growing in Colorado are Mesa, Delta, Montrose, and Montezuma counties.
- Peaches account for over 75% of fruit production in Colorado."
Oregon is that way with pears https://oregonaitc.org/resources/oregon-resources/oregon-grown-commodities/pears/
"
Oregon is ranked number two in United States pear production. The only state that grows more is Washington. Oregon grew 32% of the country’s pear in 2020. That was 210,000 tons. That’s 420 million pounds! All those pears were worth over 97 million dollars. It was Oregon’s 14th most valuable crop. There are 967 farms in Oregon growing pears on close to 14,000 acres. Most of those pears are grown in Hood River County and Jackson County."
California is the same Pear in California
“European pear cultivars commonly grown in California are better suited to the warm climate in California, warm summer temperatures are necessary for proper fruit maturation. Without warm temperatures during the six to eight weeks prior to harvest, pears will not attain optimum shipping quality (Elkins et al. 2007). Additionally, pear trees in Sacramento, Lake and Mendocino counties (primary growing regions) have a greater survival rate if located near cool water because it decreases the incidence of fire blight, frost, freeze and drought (Elkins et al. 2007).”
I would assume if CO is super good for peaches it would be good for pears. Why is it so good for peaches but not pears?
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To better understand what good fruit country is it is best to learn about wine growing areas first What is Wine Country? | Halleck Vineyard. That does not mean your area or those areas are bad for pears. The soil , the rock in the soil , the water, climate , variety, process used etc. all impact how fruits taste. Napa valley is notorious for wine because it grows great tasting wine grapes. If you want a really great onion than a real vidalia is great. Sure other people grow them but only one place has real vidalia onions Vidalia onion - Wikipedia
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I have Shinseiki on OHxF 333 (DWN tree) and grafted a bunch of varieties on it. It took about 3 years for varieties to slowly start producing. The exceptions are Hosui and Ya Li and they are precocious. It’s easy to keep the tree at 6 feet. This year (6 years in the ground) it has settled into producing what I want from that tree (about 50-60 pears across 7 varieties after thinning). I bench grafted Warren on a couple of OHxF 87 rootstocks and planted them in spring. I hear 87 is more precocious and vigorous than 333. I need to see how they perform in my yard
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Great to hear. I have one OFx87 tree, maybe I get a Warren Scion and graft it to that tree.
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It’s taken me a while to decide just how to respond to the answers to my last post. Here are some thoughts from a retired physician who actively practiced medicine for over 50 years.
Before I start this I want everyone to know that Warren and Magness are the two family favorite pears and if we could grow only a few pears those would definitely be two of the three or four trees.
First – don’t believe everything you read as true. If it does not seem to fit the facts or your experience, question it. That doesn’t mean that you immediately reject it but just search for evidence to back it up.
So, I need more evidence to back up the statements from nurseries and others that Warren is a good pollen source for other varieties and that it is self-fertile.
If it is self-fertile, why is it such a shy bearer? Think of other self-fertile pears like Conference, Seckel and Bartlett (under some conditions). According to UC Davis (Pear in California ) Bartlett is really parthenocarpic. My impression is that Warren will also set a few parthenocarpic fruit. Conference is often grown in the UK without pollinating varieties but parthenocarpic Conference fruit is often quite misshapen. Yields of marketable fruit increase with pollination partners.
This year I have a minimal set of fruit on my two Warren trees. The bloom season was brief and the weather conditions were not very good. That said, Magness and most other varieties blooming at the same time set well. Since I’ll have so few fruit this year I’ll look at all of them to see if there is what looks like viable seed or if maybe some of the fruit are parthenocarpic.
Does anyone have a source of research data that proves the viability of Warren pollen? Have controlled studies been done to document that Warren is indeed a good “universal” pollinator? And finally, when did this information start appearing in nursery catalogs and from other sources? Who was the first to state it? My Google searches have not been successful and I do not have access to the Pomological journals where research data is presented. I’m not interested in anecdotal data.
I still like the Burntridge chart that shows Warren as pollen sterile. But, I’m certainly willing to change if there is good evidence to the contrary.
One last thing – T.O. drove me around Hattiesburg and pointed out the tree he said was the original Warren. He never admitted to me that he snagged a scion from the defunct test nursery in Meridian – about 87 miles away. I moved to CA about 18 years before he died and we never discussed the pear after I moved.
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These are very legitimate points. Warren is frequently not discussed as being self pollinating or as a good source of pollen for other trees. Professional growers are very closed mouth about warren. One thing none of them can hide is how they grow it in large blocks. We will find more information on warrens sibling that will give us some clues. Magness was named US 3866-E .in the studies. In order to understand pear pollination this will help others reading this
"Magness is highly resistant to fireblight. The main cultivation difficulty with this variety is that it can be slow to bear. This is addressed by using OHxF rootstocks and by spreading young limbs. Mature trees are productive if pollination is provided; Magness is not self-fertile, and it does not provide viable pollen for other varieties. There are, however, no known European pear varieties with which Magness will not set fruit.
Ripening late, about three weeks after Bartlett, the fruit is medium sized, oval, and lightly russeted. It is a dessert pear of the highest quality, with soft, juicy, and aromatic flesh. Our nursery manager says that it is “unparalleled,” and that “at the crown of the Tree of Life, a Magness awaits all who seek it.” I guess he likes it. It will ripen well after being in cold storage for as long as three months (maybe longer at the top of the Tree of Life).
Magness is a cross of Seckel and Doyenne du Comice, both of which are outstanding dessert pears. It is named for John R. Magness, who was chief of the Fruit and Nut Crops section of the USDA until 1959."
“Magness originated in Beltsville, Maryland, by U.S. Deptartment of Agriculture. Introduced for trial in 1960 and released in 1968 by Howard J. Brooks. It is a cross between Seckel seedling and Comice. It tested as US 3866-E and was named in honor of John R. Magness, who was leading the fruit and nut crops section at Agricultural Research Center, in Beltsville, Maryland. The fruit has good quality and medium size, with soft flesh and it is very juicy and aromatic. The fruit ripens a week later than Bartlett. It has good storage quality and can be held in cold storage up to 3 months, with storage it quality improves. The tree begins bearing at about 6 years and early fruiting is happening mainly on medium long terminals. It is entirely pollen-sterile, and it not produce good pollen and should not be used as a pollenizer. The tree has good resistance to fire blight. It can grow USDA hardiness zones 5-9”
Back to warren pear
" Warren Pear Tree
An excellent pear variety for those of you that like silky, buttery flesh that has no grit to it. Discovered by Thomas O. Warren, one of the founding members of the North American Fruit Explorers (NAFEX). Plants make great pollinators, are fire blight resistant, and the fruit is a perfect combination of sweet, spicy and juicy!
SKU: WARNCategories: European PearsPearTag: European Pears
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Warren Pear Tree
An excellent pear variety for those of you that like silky, buttery flesh that has no grit to it. Discovered by Thomas O. Warren, one of the founding members of the North American Fruit Explorers (NAFEX). Plants make great pollinators, are fire blight resistant, and the fruit is a perfect combination of sweet, spicy and juicy!
Pear trees are one of the world’s most popular and delicious fruit. Pears grace us with their delicious flavor, sweet, juicy flesh, and attractive form.
Latin Name: Pyrus communis
Site and Soil: Warren Pear likes full to 1/2 day sun and well-drained soil.
Rootstock Description: A dwarfing rootstock for European Pears, OHxF 513 produces trees 10-15 ft. in height.
Pollination Requirements: Needs another European Pear variety nearby for cross-pollination. Our Asian Pear varieties can also be used as pollinators.
Hardiness: Hardy to minus 25°F. or below.
Bearing Age: 2-3 years after planting.
Size at Maturity: 10-15 ft. in height.
Taste: Sweet, juicy
Fruit Skin: Yellowish-green with red blush
Fruit Size: Medium
Bloom Time: April
Ripening Time: Early September
Yield: 50+ lbs.
Pests & Diseases: Our European Pear varieties are generally quite disease resistant and easy to grow. Except for occasional problems with Codling Moth, we have not seen significant insect damage on our varieties.
USDA Zone: 4-8"
Raintree says this
" WARREN EUROPEAN PEAR
Pyrus communis ‘Warren’
Warren is your best friend in the pear department! Adapted throughout most of the nation and among the very best backyard choices, with fruit that is juicy and sweet, a buttery texture, and very good keeping abilities. Discovered in Hattiesburg, Mississippi by noted horticulturist T. O. Warren, and truly the best choice for Southern growers. Fruits are medium to large, have a teardrop shape and green skin.
Extremely resistant to fireblight, somewhat resistant to cedar trellis rust, and cold hardy. Also known to be low chill - 500 hours or less. Considered a “Universal Pollenizer” as bloom category 2. Needs a pollenizer.
USDA Zone: 5-9
Grow Height: 15’ (Semi Dwarf)
Sun: Full Sun
Ripening Time: October
Pollination: Needs a Pollinizer
"
Gurneys says this
" * Good storing pear
- Excellent texture for cooking
- Resistant to fire blight
One of the best dessert-quality pear varieties to grow in the South, Warren Pear Tree bears medium to large, long-necked, pale green fruits that are sometimes blushed with red. The fruits have a juicy, sweet flesh with a wonderful buttery texture. The firm flesh holds up well to cooking and poaching. The fruits also store well. Discovered in Hattiesburg, Mississippi several decades ago, this pear tree performs well in all the Coastal South areas, as well as all areas of zones 7-9. The trees are very resistant to fire blight. 600 chill hours are required for a successful harvest.
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Botanical Name: Pyrus communis ‘Warren’
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Height: Standard: 25 feet
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Spacing: Standard: 20 feet
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**Depth:**Locate the planting depth indicator, the marked line above the tree’s root system. The graft should be about 2 inches above the soil surface.
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**Spread:**Standard: 25 feet
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**Light Required:**Full Sun
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**Pollinator:**Self-pollinating
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Color: White flowers.
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Size: Standard 2-4’
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Blooms: Mid Spring, Late Spring
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Fruit: Medium to large fruit, buttery; juicy flesh with excellent flavor. Long-necked fruit with pale green skin, sometimes blushed red.
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Zone: 7-9
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Form: Fruit Tree, Fruit, Pear, Standard Pear Tree
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Soil Requirements: Loamy Soil
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Growth Rate: Medium
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Foliage: Shiny green foliage.
Look what the questions were related to warren
"
of 7 Questions
Q
Do I need more than one warren pear tree to polinate?
Asked by Jan 19 days ago
ADD YOUR ANSWER
Verified Reply - AngelaThe Warren Pear Tree is self pollinating. You only need one to produce fruit.
00
Q
Is this Warren Pear bare root?
Asked by Liz 1 month ago
ADD YOUR ANSWER
Verified Reply - AngelaThe Warren Pear Tree is shipped as a bareroot tree.
00
Q
Could this be used to pollinate a sand pear tree we already have on the property we bought?
Asked by dslodge 1 year ago
ADD YOUR ANSWER
Verified Reply - AngelaI apologize but I don’t know what will pollinate a sand pear. You might try contacting your county extension office for guidance. There are apparently quite a few varieties. The most important factor in selecting a pollinator is bloom time.
00
Q
Do you have the Warren pear trees in semi dwarf
Asked by David 1 year ago
ADD YOUR ANSWER
Verified Reply - AngelaThe Warren Pear Tree is only available in the standard size at this time.
01
Q
Can a Warren pear tree be cross polinated by another fruit tree like apple or peach or do you have to get two Warren Pears?
Asked by Desi 1 year ago
ADD YOUR ANSWER
Verified Reply - AngelaThe Warren Pear Tree is self-fertile. You only need one to produce fruit.
00
Q
The Warren Pear I ordered has arrived. I was disappointed to see that it has thorns. Are the thorns only on the part of the plant to which it was grafted? Or will those thorns be on the whole tree?
Asked by waiting to see 3 years ago
ADD YOUR ANSWER
Verified Reply - MarkI found this online. “Consider yourself warned pears do have thorns in many cases when they are younger. In some cases such as Warren pear the thorns are frequent.” They grow out of it somewhat. Warren is an excellent pear. I saw the original last year.
20
Q
Today is August 24, 2019. For the first time in 6 years I have about 12 Warren pears on my tree. How can I know when to pick them? MY tree is covered with leaves that have Blister mite, but the pears seem OK. I am told to wait till leaf drop to spray it with a dormant oil spray.
Asked by Celia 4 years ago
ADD YOUR ANSWER
Verified Reply - ViciThe skin is green when immature, developing to an earthy yellow-brown as it ripens. It is really a preference whether you like your pears crispy or soft. If you happen to pick them a little early, they will continue to ripen once picked. Yes. A dormant oil spray is applied when the leaves have dropped and the tree is dormant."
" The Wonderful Warren Pear and A Pear Butter Recipe”
Posted on October 15, 2017 by erinpollen
Warren Pears… sweet, juicy, addicting!
If you can get your hands on some Warren pears do so immediately and you will be in for the best tasting pears on the planet! A cross between the Seckel pear and the Comice pear, it has thin, edible skin, smooth, ungritty flesh and a flavor full of honey, vanilla and heaven! Seriously, we discovered we had a Warren pear tree growing in the school garden this year when, for the first time (it is 4 years old), it bore a huge crop of big, juicy pears that were so good the children AND their parents were fighting over them! I researched Warren pears and discovered they are considered one of the best pears around, but we had already figured that out.
One article I read claimed this pear was discovered by Thomas Oscar Warren growing naturally outside a post office in Hattiesburg, MS. It was known as the Post Office pear for awhile before taking on its founder name. However it was developed, it is truly a fabulous pear. The tree is self-pollinating, very resistant to blight (a big plus), super hardy and grows very fast and tall. To anyone who grows fruit trees, this one is a must-have! I’ve already ordered one from our nursery for my own garden👍.
These pears are fantastic just by themselves, but I wanted to save some of their yumminess for later so I made a pear butter that is incredible… and super easy to make. I canned some for later but you could freeze it, too. It will also last a few weeks in the fridge, if you can resist eating it immediately. If you cannot find Warren pears, use Comice, Seckel or Anjou pears. I would not recommend Bartletts just because they are much grittier and do not have the complex flavors of other pears that make this Pear Butter so irresistible.
RECIPE for Pear Butter
- 2-5 lbs. ripe pears (depending on how much you want to make)
- 1/8 to 1/4 cup water
- 1TBSP lemon juice
- cinnamon to taste
- 1/2 tsp vanilla
DIRECTIONS:
- Wash and core the pears. You can peel them or not, depending on how smooth you want the Pear Butter. If they have thicker skin definitely peel them.
- Cut pears into small chunks, place in large bowl & sprinkle lemon juice over the the top.
- Put pears into a large pot, add the water and bring to a boil. Turn heat down to low and let them cook for an hour or more, stirring often to keep from burning.
- When pears are completely cooked down add some cinnamon & vanilla to your taste. Continue to cook until they thicken to an applesauce-like consistency.
- Using an Immersion Blender, purée the butter until completely smooth.
- At this point, your Pear Butter is ready. If you made a big batch you may can some of it or put some in freezable containers (once it has cooled). If you made a smaller batch, it will keep in the fridge for a few weeks.
- This delicious spread is great on toast, muffins, bagels, in yogurt, over ice cream or oatmeal, or try a smear on a grilled cheese sandwich. I have to restrain myself from just eating it straight out of the the jar😋!
"
Clark, that is a wall of text.
After studying existing documentation carefully, I’m comfortable stating that Warren is NOT self-fertile. It is readily pollinated by just about every other European pear. The evidence so far suggests pear uses a similar self-sterility strategy as apple. Apple has “mating types” where type 1 will pollinate with any other type except type 1. Since there are about 50 mating types in apple, I suspect there will be a similar process with pear. This is unproven, but highly supported by available evidence.
It is partially self pollinating not pollen sterile. Time will tell the rumor of it being sterile is incorrect. Everyone is entitled to their opinion. Not one person has produced a single good source of evidence proving it is pollen sterile like magness.
Clark,
Even the info you posted above contains conflicting info. For example, the first one said Magness’ shape was oval and ripens 3 weeks after Barlett. Cummins said Magness ripens one week after Barlett.
Mehrabyan’s sketch showed Magness looks no where near “oval.”
Also, these sources of info you posted are from nurseries. As you know, they don’t do research. They just copy from each other. If one is incorrect, many will be, too. Even the pics can be way off.
It is also confusing to switch back and forth between Magness and Warren in the same post.
@mayhaw9999 has asked for research data. That would lend more creditability than descriptions from nurseries, IMHO.
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We have been going down this road for years. @mayhaw9999 and i both know Warren was discovered and the evidence of its breeding does not exist any longer. He knew the gentleman the pear is named after. The reason magness comes up is because the only study that might be found would be on magness not warren. At this point i will be content to grow my warren trees and be satisfied with the heavy yields i get.
https://npgsweb.ars-grin.gov/gringlobal/accessiondetail?id=1436384
https://npgsweb.ars-grin.gov/gringlobal/accessiondetail?id=1436235