RT Journal Article T1 Resin yield response to different tapping methods and stimulant pastes in Pinus pinaster Ait A1 López Álvarez, Óscar A1 Zas Arregui, Rafael A1 Martínez-Chamorro, Enrique A1 Marey Pérez, Manuel K1 Pinus pinaster K1 Tapping methods K1 Stimulant paste K1 Constitutive defences K1 Inducibility of defences K1 Standard resin yield AB Selecting the best resin tapping method and stimulant paste in the resin tapping process is crucial. In timber-oriented rainy Atlantic pine forests of north-west Spain, the interest in resin tapping is raising but information on the best tapping methods and pastes is still lacking. In this study, an appropriate experimental design used on five representative plots of Pinus pinaster, allowed us to explore the resin productive differences between two tapping methods (traditional Spanish method and circular groove) and three stimulant treatments (control, Ethephon and ASACIF). The use of a standardized measure of resin yield allowed to adequately compare methods differing in groove length. Results indicated that the standard resin yield was 1.43 times greater with the traditional method than with the circular groove method. The two stimulant pastes drastically increased resin yield (up to sixfold) in all sites and for all tapping methods. The effectiveness of the paste was also influenced by the tapping method, obtaining greater increases in resin yield after the application of stimulant paste in trees with the circular groove method. Resin yield was only slightly related to the dasometric variables and varied among test sites when no pastes were used, but differences among sites disappeared when stimulant pastes were used. Our results contribute to the understanding of the factors involved in resin performance and the technological development of the sector PB Springer SN 1612-4669 YR 2023 FD 2023 LK http://hdl.handle.net/10347/30863 UL http://hdl.handle.net/10347/30863 LA eng NO López-Álvarez, Ó., Zas, R., Martínez, E. et al. Resin yield response to different tapping methods and stimulant pastes in Pinus pinaster Ait. Eur J Forest Res (2023). https://doi.org/10.1007/s10342-023-01590-9 NO Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. This work was supported by the Spanish Government (“ACREMA”, MAPA/AEI-Agri/FEADER, UE) [O00000226e2000043659]. This work was supported by the Spanish Government (“ACREMA”, MAPA/AEI-Agri/FEADER, UE) [O00000226e2000043659]. The authors thank FORESIN, CIF Lourizán, CETEMAS and MBG-CSIC for the field assessments DS Minerva RD 27 abr 2026