Chetoui Download sheet Fruit Denomination and synonyms Origin and diffusion Originated from Mannouba in the north of Tunisia, It is cultivated in almost the north of the country with nearly 12% of the total areas and counted 30% of the total olive trees (Olivae, 2017). Thus, Chétoui is considered the second main oil variety in Tunisia. Fathi Ben Amar Purpose Oil Morphological characterisation Tree Vigour Medium Growth habit Upright to spreading Canopy density Medium Fruit Weight Medium Radio length/width in position A Moderately elongated Over colour at full maturity Dark violet Symmetry in position A Strongly asymmetric Shape of apex in position A Acute Nipple Absent or weak Shape of base in position A Truncate Leaf Length Medium Width Medium Radio length/width Slighty elongated Curvature of longitudinal axis Recurved Stone Radio length/width Moderately elongated Weight Medium Shape of apex in position A Acute Symmetry in position A Strongly asymmetric Symmetry in position B Weakly asymmetric Shape of base in position A Rounded Number of grooves on basal end Between 7 and 10 Distribution of grooves on basal end Evenly distributed Mucron Absent Rugosity of surface Medium Molecular characterisation (SSRs) UDO-43 DCA3 DCA9 DCA16 GAPU-101 175/214 229/237 192/192 122/173 191/205 Agronomic characterisation and commercial considerations Chétoui is adapted to areas with cold winters (north) since its behaviour in the centre-south of Tunisia is characterized by low productivity (Elloumi et al. 2017). Oil quality of Chétoui degradation is observed in saharian climate: high temperature, high light intensity and low rainfall (Dridi et al. 2016). The tree is autocompatible with low vigor, medium maturity and good propagation rate by cuttings (Trigui and Msallem, 2002; Trigui, 1996). Depending to the region and maturity stage, its acid composition is characterised by high level of oleic (63 to 70%) with fat rate between 24 and 28% (Grati-Kamoun and Khlif, 2001; Elloumi et al. 2017). For sensorial profile, the oil has intense fruity aroma of green almond with bitter and spicy taste (Grati-Kamoun and Khlif, 2001). This variety is characterised by high alternate bearing and low vigor in irrigated and rainfed conditions and this character seems to be under genetic control (Trigui, 1996; Ben Amar et al. 2019c; Elloumi et al. 2017).Chétoui was extremely susceptible to Verticillium dahliae (Yaacoub et al. 2017) and moderately susceptible to salinity and draught (Elloumi et al. 2022). It is found resistant to olive mite (Chatti-Kolsi et al. 2016). Fathi Ben Amar