420 A Millardet et de Grasset

Active

Vitis berlandieri Planch. x Vitis riparia Michx. · Fruit crops

also searched as: 420 а миллардет ет де грассет

Variety description

10 August 2026

The variety has a male flower type and does not form clusters. The growing season is short; the bushes have medium vigor, with shoots reaching a length of 2.5–3 m. Cane maturation is high, about 85%.

The rootstock is characterized by high resistance to the root form of phylloxera and fungal diseases, as well as medium resistance to the leaf form of phylloxera and nematodes. It prefers fertile stony, clay, and loamy soils, tolerates up to 30% of total lime, but does not tolerate heavy, acidic, waterlogged, or arid soils well.

Graft compatibility is satisfactory, sometimes requiring increased stratification time. The rootstock promotes good inflorescence initiation in the scion and restrains the growth of vigorous varieties; however, it does not assimilate potassium very well, which can lead to the manifestation of a deficiency of this element in the scion.

Sources2

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Countries of admission

1 jurisdiction

Green indicates countries where the variety is listed in the national catalogue and its seeds are authorized for sale. Expired registrations are marked separately: the variety was previously admitted, but sale is no longer permitted.

IS FI NO SE EE IE GB DK LV LT NL DE PL BY PT ES FR BE CZ SK UA RU LU CH AT HU MD IT SI HR RS RO MT GR BG CY

active no record

Variety in registries Regions of admission, rights holders, and status of plant breeders' rights

Parties

Applicant: Hochschule Geisenheim University Institut für Pflanzenzüchtung 52 Submitted the application to the register
Maintainer: Hochschule Geisenheim University Institut für Pflanzenzüchtung 52 Responsible for variety maintenance

Admission to trade

The variety is listed in the national registry — its seeds are authorized for sale in this country.

DE Germany Active

№ RBU 00019

Application

12 February 2001

Registration

14 April 2005

Registry	Number	Application	Registration	Terminated	Status
DE Germany	RBU 00019	12 February 2001	14 April 2005	—	Active

Records are sourced from official registry publications. Data sources and legal status

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