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Tuesday, April 21, 2020 | History

2 edition of Development of blight resistant French pear rootstocks found in the catalog.

Development of blight resistant French pear rootstocks

F. C. Reimer

Development of blight resistant French pear rootstocks

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  • 2 Currently reading

Published by Agricultural Experiment Station, Oregon State College in Corvallis, Ore .
Written in English

    Subjects:
  • Pear -- Disease and pest resistance -- Genetic aspects.

  • Edition Notes

    Cover title.

    StatementF.C. Reimer.
    SeriesStation bulletin / Oregon Agricultural College Experiment Station -- 485., Station bulletin (Oregon State College. Agricultural Experiment Station) -- 485.
    The Physical Object
    Pagination24 p. :
    Number of Pages24
    ID Numbers
    Open LibraryOL16017594M

    A new fireblight-resistant, European pear selection bred by Dr. Richard Bell at the U.S. Department of Agriculture's Appalachian Fruit Research Station in Kearneysville, West Virginia. The selection, known as for short, came from a cross of Sheldon and selection US It is a European pear but can be consumed fresh at harvest.


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Development of blight resistant French pear rootstocks by F. C. Reimer Download PDF EPUB FB2

Although Development of blight resistant French pear rootstocks book French pear rootstocks are susceptible to Erwinia amylovora blight, a few resistant seedlings were obtained from inoculation trials and pollinated by the highly resistant variety Farmingdale.

Vigorous, blight resistant seedlings for use as rootstocks were obtained from the crosses P18 × Farmingdale, W1 × Farmingdale and Burkett × : Reimer, F. C., b. A semi-vigorous pear rootstock, about 2/3 standard size. Resistant to fire blight, crown rot, woolly pear aphids, and pear decline. Precocious, well-anchored.

Patented with a 50¢ royalty fee. OFxF40 is not very precocious and is not recommended to use with Bosc, which would result in fewer and small fruit.

Bartlett rootstocks are generally less vigorous than Winter Nelis. However, the paternal seed parent is never known and there is a substantial amount of variation among individual seedlings (Reil et al. Bartlett rootstocks are susceptible to fire blight. betulaefolia is the most vigorous of all pear rootstocks.

It can tolerate a wide. Even relatively resistant trees, such as Red Delicious, may get fire blight after a hail storm or if they are in a mixed planting with susceptible varieties or pears. Relative Fire Blight Resistance of Apple and Pear Varieties and Rootstocks. Author: A.D. Webster: Keywords: Quince rootstocks, clonal rootstocks, Pyrus rootstocks, graft compatibility, genetic engineering DOI: /ActaHortic Abstract: Most European Pear (Pyrus communis) scion cultivars are propagated on either rootstocks of the same species or on quince (Cydonia oblonga) onally, other Pyrus species, such as P.

Because of fire blight, most of the United States pear crop now comes from northern California, Oregon, and Washington, where the predominantly dry climate discourages the spread of this disease. If you live outside of this region, you can still grow pears successfully by selecting blight.

Its resistance to fireblight, collar rot, woolly pear aphids and pear decline make this a very healthy stock. Precocious, well-anchored. Trees are very productive. Some reports that fruit size is reduced. OHxF 40 A semi-vigorous pear rootstock, about 2/3 standard size. Resistant to fire blight, crown rot, woolly pear aphids, and pear decline.

The Cornell program is evaluating rootstocks from Vineland in Canada, from Poland, from Pillnitz in ­Germany, from Marioka in Japan, and others. Two Msize rootstocks in the Pillnitz program, PiAu and PiAu, have been found to be resistant to fireblight, as has the Msized B   Abstract.

Fire blight, caused by the bacterium Erwinia amylovora (Burrill) Winslow et al., is the most serious disease affecting the European pear, Pyrus communis L., in North America, Europe, and the Middle East. Control of fire blight is difficult, thus rendering the development of resistant cultivars and rootstocks a high by: 1.

The bacterium that causes fire blight overwinters in cankers and oozes out the following spring to re-infect the plant. Photo by Janna Beckerman Cultural Practices Disease can be minimized, and even prevented, by good horticultural practices (namely, the use of resistant culti-vars and resistant rootstocks).

Additional cultural practicesFile Size: KB. In Oklahoma the Kieffer pear (actually a hybrid between Bartlet and an Asian pear) is said to be resistant to fire blight, which is common. Around here the Kieffer is actually sometimes called the "homestead" pear because it's the most likely fruit tree to find still alive and producing on old home sites that have been vacant for decades.

Rootstocks for Pear trees The choice of rootstocks for pear trees is more limited than it is for apples reflecting the fact that pears are not as commercially important as apples.

Whereas rootstocks for apples and plums come from closely related Malus and Prunus species respectively, the situation with pear rootstocks is more unusual.

Disease-resistant pear varieties The fifth chapter of The Holistic Orchard is about pome fruits apples, pears, and quinces. Of these, quinces seem to be very prone to fire blight damage, and I've posted about disease-resistant apple varieties previously, so I thought I'd sum Development of blight resistant French pear rootstocks book Phillips' (and Lee Reich 's) tips on choosing resistant pears.

Rootstocks. We graft our trees on domestic pear seedling for standards requiring 20 foot spacing, and OHxF clonal rootstock for semi-dwarf trees (15 foot spacing). Both pear rootstocks tolerate heavier, wetter soils than most other kinds of fruit.

nongrafted rootstocks with rootstock blight development in blossom-inoculated grafted trees. Results indicated that B.9 rootstock was susceptible to shoot inoculation but resistant to rootstock blight development as grafted trees. A contradictory report by Travis et al.

(39) reported that grafted B.9 rootstock was susceptible to fire blight;Cited by: 6. The principal diseases of pear trees that are related to rootstocks are fire blight, pear decline, and Pseudomonas bacterial blight. If the rootstock produces suckers, as many do, and if the suckers are susceptible to fire blight, the disease may enter the root system, where it is almost impossible to control.

Pear decline is a disease thatFile Size: KB. G Dwarf. From the USA and bred in the s this rootstock is a cross between M26 and Robusta 5. Resistant to fire blight, phytophthora and tolerant to frost, this rootstock is slightly more vigorous than M9 and more productive.

M - Semi Dwarf. Requires support on most sites. Good for bush and cordons in limited spaces. Suits certain. Induction of systemic acquired resistance aids restoration of tree health in field-grown pear and apple diseased with fire blight.

Plant Disease Stockwell, V.O., Johnson, K.B., Sugar, D., and Loper, J.E. Mechanistically compatible mixtures of bacterial antagonists improve biological control of fire blight of pear. used as resistant to fire blight, pear psylla, an d cold hardy. Role of rootstocks in stone fruits In India, the stone fruits like peach, plum, apricot and almond.

Domestic Seedling Pear - The most widely planted pear rootstock, typically produces a vigorous tree with strong, well-anchored roots. Tolerates a wide range of soil conditions, moisture content and texture.

Resistant to pear decline and fire blight. The best dwarfing root for pears. Stone Fruit Rootstocks. Newsletter Sign Up. Quince is used as a dwarfing rootstock for pear, depending on the scion desired and characteristics of the production area.

Regarding pear production in Europe, Wertheim, a plant breeder in the Netherlands, discusses the use of quince as a dwarfing rootstock in high-density European-pear (Pyrus communis) plantings where small trees are characterizes good dwarfing rootstocks as those.

(Formerly known as Harovin Sundown & Kanata™) Cold Snap™ is an attractive late-season fresh market pear with good storage capability. It is highly productive with no biennial bearing.

The tree has excellent resistance to fire blight (a bacterial disease incited by Erwinia amylovora). ny blight-resistant pear tree should be growing on a blight re-sistant stock as this disease can develop in roots.

The Pears of New York states that "The hybrids (of Pyrus sera tina culta) do not make good stocks and intergrafts but poorly with the common pear." Reimer3 has made a careful study of pear stecks and their blight resistance.

PY1. The most common rootstock used is seedling. You may occasionally find pears grafted onto hybrid rootstocks developed from crossing Old Home and Farmingdale varieties.

These selections were developed because of their moderate resistance to fire blight. Table 1. Vigour of the pear rootstocks in Australia in similar groupings as in apple Group European Pear Nashi 1 dwarf 2 3 Pyrodwarf 4 CQCQ 5 Quince C, CQCQ 6 Quince A, OHF 51 69, 97,CQCQCQ BP 1 7 BA 29, BP 1, BP 3 P.

pyrifolia P. communis 8 BP 3, OHF File Size: KB. Rootstocks for Pear and Quince trees The choice of rootstocks for pear trees is more limited than it is for apples, reflecting the fact that pears are not as commercially important as apples.

Whereas rootstocks for apples and plums come from closely related Malus and Prunus species respectively, the situation with pear rootstocks is more unusual. Semi-vigorous. Considered a semi-dwarf tree.

Tolerant to blight and decline. OHXF Good anchorage & vigor. Induced early heavy production. Resistant to pear decline and fireblight. It is a superior rootstock for vigorous pear trees. Hardy and resilient to cold.

Horner 4 Appears to be extremely productive, and produces a large and fairly. Genotypes of clus viz. B and 99 A from USDA andDaru and IIHR from India, were found to be resistant to bacterial blight while genotypes of cluster 9 were highly susceptible.

Fire blight development is influenced primarily by seasonal weather. Warm spring weather, accompanied by intermittent rain and hail, is ideal for disease development. Other influences on disease development are the varieties and rootstocks used in the orchard, location of the orchard, application of too much nitrogen fertilizer, heavy pruning.

Fire blight is a common and very destructive bacterial disease of apples and pears (Figure 1). The disease is caused by the bacterium Erwinia amylovora, which can infect and cause severe damage to many plants in the rose (Rosaceae) family (Table 1).

On apples and pears, the disease can kill blossoms, fruit, shoots, twigs, branches and entire trees. Fire blight is a tree disease caused by the bacterium Erwinia amylovora. Impacting pear, apple, crabapple, cotoneaster, mountain ash, hawthorn, pyracantha, spirea, and many species in the rose family, it is highly destructive and difficult to control.

Outbreaks occur in spring as the bacteria multiply. Varieties and Rootstocks. Most pear trees sold in Arkansas are budded onto. Pyrus calleryana, a disease-resistant, drought-tolerant rootstock. The Old Home pear is also used as a root­ stock, and trees from nurseries outside Arkansas may be budded to this variety.

Trees budded to either of these rootstocks are full-sized and usually long-lived. Fire blight, also written fireblight, is a contagious disease affecting apples, pears, and some other members of the family is a serious concern to apple and pear producers.

Under optimal conditions, it can destroy an entire orchard in a single growing : Erwiniaceae. using resistant cultivars and resistant rootstocks. Resistant rootstocks will only prevent the death of the tree from rootstock infections. The resistance is not transferred to the scion.

No cultivars are completely resistant to fire blight, but some are moderately resistant such as Red Delicious or Liberty. If fire blight is a common problem in.

French Translation of “blight” | The official Collins English-French Dictionary online. OverFrench translations of English words and phrases. Most Asian pear cultivars are considered to have good resistance to pear scab.

Removing and raking up leaves and discarding them or hot composting them is important for reducing disease incidence. Running leaves over with a mulching mower will hasten decomposition and.

The main line of defense against fire blight is to choose the correct varieties for your location. Howev-er, some fire blight infection is inevitable because high rainfall, especially during bloom or in the heat of sum-Figure 6. A pear tree damaged by fire blight. Figure 5. Weights on a pear tree to help spread the limbs and encourage lateral File Size: KB.

Postman JD. The USDA Quince and Pear Genebank in Oregon, a world source of fire blight resistance. Acta Hortic. ; – Sobiczewski P, Żurawicz E, Berczyński S. Trends in breeding of cultivars and rootstocks of apple and pear resistant to fire blight (in Polish, English summary) Postępy Nauk Rolniczych.

; –Cited by: 4. Fire blight is a disease found in most pear and apple growing areas in the United States. Fire blight causes large amounts of destruction to blossoms, fruits, scaffold limbs and leaves, making it one of the most damaging tree diseases for fruit bearing plants.

Rootstocks are selected based on traits like tree size, anchorage and level of productivity, fruit quality, soil and climate adaptation, level of disease and parasite resistance, age at first fruiting, fruiting efficiency and tree longevity.

A complete book could be written about selection of pear rootstocks, but I need to keep this simple. A rootstock is part of a plant, often an underground part, from which new above-ground growth can be produced.

It could also be described as a stem with a well developed root system, to which a bud from another plant is grafted. It can refer to a rhizome or underground stem.

In grafting, it refers to a plant, sometimes just a stump, which already has an established, healthy root system, onto.Not only do the pear trees grown for their edible fruit succumb to fire blight, but also ornamental types such as 'Aristocrat' pear trees.

While Bradford pear trees are relatively resistant to fire blight, that does not mean that they are totally immune to it (especially in warmer climates). Blackened flowers are an indication of fire blight.Fire blight on pear trees can be quite a problem in certain areas of the country and we are pleased to offer fire blight resistant varieties in our bare root pear trees available online.

Of the European pears, Harrow Delight, Warren, Moonglow, Hood, Monterrey, Kieffer, Orient, Seckel, Potomac and Blake's Pride are all resistant to this.