Improve apricot tree health with interstems in central and northern Europe

Interstems enhance apricot tree health and extend orchard lifespan in central and northern Europe by reducing dieback and sudden wilt (apoplexy). They delay spring sap flow, reduce tree vigour and crown volume, delay flowering to avoid frost damage, and improve fruit size and quality. Grafting with compatible interstems—such as Stanley, Greengage, or Redhaven—resolves rootstock-variety incompatibility. White paint or covers on stems minimize cracking and lower infection risk from Pseudomonas syringae. The method requires an extra nursery year, increasing costs. Chip budding and English copulation are key grafting techniques. Limited data exist on organic suitability, requiring further research. Supported by BIOFRUITNET, 2023, Czech Republic.