20.500.12556/RUL-171332 Control of diffuse abaxial apple scab by the systemic fungitoxicity of fluopyram and the defense enhancement of fosetyl‑Al Diffuse scab symptoms (Venturia inaequalis) on the abaxial leaf surfaces of apple trees (Malus×domestica Borkh.) coincide with increased infection pressure in apple orchards. The epidemiology of diffuse abaxial scab has been linked to both quiescent primary and secondary infections that proliferate in the summer. These symptoms are often overlooked and initially appear on cluster leaves and later spread intermittently along the shoot from basal toward apical leaves approximately 7–8 weeks after leaf unfurling. In this study, we investigated the effect of Luna® Care® (FLU&FEA), a fungicide containing fluopyram (FLU) and fosetyl-Al (FEA), on scab development under field conditions. FLU&FEA treatments positioned in the post-flowering period were most effective against diffuse abaxial scab and were associated with the combination of direct effects against the fungal pathogen and plant defense enhancement by fluopyram and fosetyl-Al, respectively. FLU&FEA reduced both the incidence and severity of diffuse abaxial scab symptoms up to 11 weeks after the last application and suppressed V. inaequalis DNA content in treated and newly formed unsprayed leaves as a result of acropetal systemic activity of the fungicide element combined with inducing the plant defences. A season-long upregulation of genes involved in leaf ontogenic resistance and biosynthesis of phenolic compounds was correlated with the FLU&FEA treatment, which also limited ascospore release from abscised overwintering leaves in the following season. As such, FLU&FEA constitutes a novel tool for sustainable and efficient scab control that inhibits diffuse abaxial scab and reduces infection pressure in the following season. Malus × domestica Venturia inaequalis control epidemiology leaf aging ontogenic resistance FLU&FEA jablana škrlup bolezni rastlin varstvo rastlin fungicidi true false true Angleški jezik Slovenski jezik Članek v reviji 2025-08-22 15:37:16 2025-08-22 15:37:21 2025-08-26 03:42:24 0000-00-00 00:00:00 2025 0 0 16 str. iss. 132, art. 43 Vol. 132 Aug. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 632.937 1861-3837 10.1007/s41348-025-01113-1 246098947 Control_of_diffuse_abaxial_apple_scab_by_the_systemic_fungitoxicity_of_fluopyram_and_the_defense_enhancement_of_fosetyl-Al.pdf Control_of_diffuse_abaxial_apple_scab_by_the_systemic_fungitoxicity_of_fluopyram_and_the_defense_enhancement_of_fosetyl-Al.pdf 1 C8A5E03D53329CFEBEFB1ACFBC19F898 9e0b7d16f82bd77b8221fda197e14d276ddc92d2b3c571cd8746107b990e3b82 2e5a0a41-7f5d-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=214606 https://link.springer.com/article/10.1007/s41348-025-01113-1 1 06f8fde4-7f5d-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=214605 Biotehniška fakulteta 0 0 0