Variety traits

Double flowering / Reversion

Reversion virus

In crop production, the term refers to two distinct concepts: a decorative trait characterized by an increased number of petals in flowers, or a dangerous viral disease of blackcurrants that causes sterility.

Mentioned in descriptions 16 231 varieties reference book.

In ornamental horticulture, double flowering is a varietal characteristic expressed by an increased number of petals in a flower to enhance aesthetic appeal. In the case of blackcurrants, double flowering, or reversion, manifests as a viral disease in which flowers are deformed into purple outgrowths, leaves lose their shape, and the plant becomes sterile.

This trait is assessed as a qualitative phenotypic indicator. In ornamental crops, double flowering is recorded during variety trials either visually or by using scoring systems for ornamental quality. Regarding currants, double flowering is considered a critical symptom, the presence of which requires phytosanitary culling of infected specimens.

Resistance of a variety to pathological reversion is determined by the genetic ability to withstand the virus and its vector, the currant bud mite. When choosing planting material for a garden, preference should be given to varieties with proven genetic resistance, as there are no numerical units of measurement for this trait.

Sources6

Breakdown by crop

Rose Double-flowering 1 377 Tulip double flowering 375 Chrysanthemum double-flowering 344 Carnation Double Flowering 336 Double-flowered Lily 164 Carnation double-floweredness 163 Double-flowering — Pelargonium zonale 162 Gerbera double-flowering 142 Dahlia double-flowering 133 Double-flowering in Begonia elatior 90 Double-flowering in Hydrangea macrophylla 88 Double-flowering in Kalanchoe blossfeldiana 77 Pelargonium double flowering 73 Hippeastrum Double-flowering 68 Double-flowering — Pelargonium peltatum 64 Double-flowering in Garden Chrysanthemum 60 Clematis double flowering 59 Azalea double-flowering 56 Double flowers in Impatiens walleriana 54 Freesia double flowers 48 Kalanchoe double flowering 41 Rhododendron doubleness 38 Double-flowering — Tuberous Begonia 38 Double-flowering — Chrysanthemum indicum 32

Found in these crops

Rose 1 840 Tulip 404 Chrysanthemum 348 Carnation 347 Carnation 165 Horseshoe pelargonium 161 Lily 148 Dahlia 141 Gerbera 139 Almond 111 Bigleaf hydrangea 98 Elatior Begonia 88

Varieties that feature this in their description

Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.

Varlon

Protection expired

Rosa L. · Rose

Verbeek, Gijsbert

DK FR HU NL SE

8 records

Poulwee

Application submitted

Rosa L. · Rose

Poulsen Roser Aps (DK)

DE DK FR IT NL

8 records

Meigovin

Active

Rosa L. · Rose

MEILLAND ALAIN ANTOINE

DE DK FR IT SE

8 records

Meibarke

Active

Rosa L. · Rose

Meilland, Marie-Louise|deceased, late of Antibes, France, by Jean-Pierre Le Naour, legal representative

DE DK FR IT NL

8 records

Korozon

Active

Rosa L. · Rose

Wilhelm Kordes / Tim-Hermann Kordes / Margarita Kordes in Fa. W. Kordes' Söhne Rosenschulen GmbH & Co KG

DE FR HU NL PL

8 records

Ruiredro

Protection expired

Rosa L. · Rose

Ruiter, Gijsbert de|Hazerswoude, Netherlands

DK FR NL SE

8 records

Red pontiac

Active

Solanum tuberosum L. · Potato

WESTON JW (US)

ES FR LU NL

9 records

Meikanrou

Terminated

Rosa L. · Rose

MEILLAND ALAIN| Alain Meilland

DE DK FR NL

8 records

Meiroudek

Terminated

Rosa L. · Rose

MEILLAND ALAIN| Alain Meilland

DE DK FR NL

8 records

Meikola

Active

Rosa L. · Rose

SNC Meilland et Cie

ES FR IT NL

8 records

Korschwama

Active

Rosa L. · Rose

Wilhelm Kordes / Tim-Hermann Kordes / Margarita Kordes in Fa. W. Kordes' Söhne Rosenschulen GmbH & Co KG

DE HU NL PL

8 records

Korfullwind

Active

Rosa L. · Rose

Wilhelm Kordes / Tim-Hermann Kordes / Margarita Kordes in Fa. W. Kordes' Soehne Rosenschulen GmbH & Co KG

BE DE NL PL

8 records

Korkleiva

Active

Rosa L. · Rose

Wilhelm Kordes / Tim-Hermann Kordes / Margarita Kordes in Fa. W. Kordes' Söhne Rosenschulen GmbH & Co KG

DE DK NL SE

8 records

Deltesse

Protection expired

Rosa L. · Rose

Pepinieres et Roseraies Georges Delbard| FR

ES FR IT NL

8 records

White Festival

Active

Gypsophila L. · Baby's breath

Michael Danziger

DE DK NL

8 records

Pouleas

Application submitted

Rosa L. · Rose

POULSEN ROSER A/S

DK NL PL

9 records

Poullen

Protection expired

Rosa L. · Rose

Poulsen Roser A/S

DK NL PL

9 records

Meifota

Active

Rosa L. · Rose

Meilland, Marie L.|Antibes, France

DK FR IT

8 records

Korprovia

Terminated

Rosa L. · Rose

Wilhelm Kordes Sparrieschoop

DE NL PL

8 records

Double

Active

Lolium perenne L. · Perennial ryegrass

DLF SEEDS A/S

DE DK UA

13 records

WEKpaltlez

Active

Rosa L. · Rose

Weeks Roses Inc (US)

FR NL

8 records

Serge

Active

Pisum sativum L. · Pea

Pure Line Seeds, USA

DE UA

11 records

Wekplapep

Active

Rosa L. · Rose

Weeks Roses

8 records

Pouldra

Active

Rosa L. · Rose

Poulsen Roser ApS

8 records

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Variety traits

Maturity group 89 063
Yield 67 000
Vigor 53 548
Plant height 51 504
Lodging 50 198
Taste and aroma 36 010
Variety origin 29 523
Productivity 27 845

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.