The Nemadex Alain Bouquet rootstock is a promising new development resulting from research aimed at adapting viticulture to contemporary challenges, particularly nematodes and climate constraints. Its breeding is part of ongoing efforts by plant breeders to provide winegrowers with robust, high-performing solutions, as evidenced by the wide range of rootstocks available today.

Origin and breeding of the rootstock

The Nemadex Alain Bouquet rootstock is the result of a varietal breeding programme. While specific details about its parentage and breeding date are not publicly detailed, it stems from complex crosses involving American Vitis species. The primary objective of this type of breeding is to enhance resistance to soil-borne pests, such as phylloxera, and to better manage environmental stresses. This approach echoes the historic importance of grafting—an essential practice since the 19th-century phylloxera crisis, as highlighted by ampelographic studies and the lost grape varieties of Bordeaux.

Rootstock profile

Soil adaptation

Precise information regarding the soil adaptation of Nemadex Alain Bouquet is still limited given its recent release. However, modern rootstocks are generally developed to offer tolerance to varied conditions, including effective adaptation to calcareous, clay, or gravelly soils. The goal is to enable better nutrient uptake, even in stressful environments.

Influence on the scion

One of the key functions of a rootstock is to influence the scion's behaviour. Although specific data for Nemadex Alain Bouquet is currently being evaluated, it is expected to impart balanced vigour, adequate water and nitrogen supply, and a positive impact on grape yield and quality. These characteristics are essential for the success of new vineyard plantings and for the adaptation of resistant grape varieties in Bordeaux.

Graft affinity and vineyard management

Graft affinity is a crucial factor for the adoption of a new rootstock. Compatibility with traditional Bordeaux grape varieties, as well as with promising varieties such as Marselan or Arinarnoa, is being studied to ensure harmonious vine development. Decisions regarding planting density, pruning, and canopy management will then be tailored to the specific characteristics of this rootstock to maximise its potential.

Sensitivities and limitations

Every rootstock has its own sensitivities. For Nemadex Alain Bouquet, research focuses on enhanced resistance to nematodes, a major issue in many vineyards. Resistance to fanleaf virus (court-noué), iron chlorosis, and other limiting factors is also being evaluated. The ability to counter these threats is an invaluable asset in today's viticultural landscape.

Relevance in the face of climate change

Climate change presents new challenges for winegrowers, particularly regarding water management and shifting ripening cycles. Rootstocks such as Nemadex Alain Bouquet, bred for resilience and the capacity to adapt to drier or more fluctuating conditions, play a major role in adaptation strategies. They help sustain the long-term viability of the Bordeaux vineyard in the face of rising temperatures and drought episodes. To learn more about resistant rootstocks, read our article on The BC 2 rootstock (Berlandieri - Colombard 2).

Château Cazebonne is actively committed to reintroducing forgotten grape varieties and trialling new practices to prepare the viticulture of tomorrow—work made possible by the support of wine lovers who enjoy our wines. To explore these topics further, we invite you to download our book "Bordeaux, une histoire de cépages", test your knowledge with our wine quizzes, and discover our wines, which reflect our dedication and our terroir.