Biological Methodologies on SDHI Fungicides to Assess Reductions of Sensitivity and Activity on <i>Venturia inaequalis</i>and Cross-Resistance Tests  

作　　者：R. Fiaccadori G. Battistini R. Fiaccadori;G. Battistini(Department of Agricultural and Food Sciences (DISTAL) University of Bologna, Bologna, Italy)

机构地区：[1]Department of Agricultural and Food Sciences (DISTAL) University of Bologna, Bologna, Italy

出　　处：《American Journal of Plant Sciences》2021年第7期1124-1134,共11页美国植物学期刊（英文）

摘　　要：Biological methodologies (</span><i><span style="font-family:Verdana;">in vitro</span></i><span style="font-family:Verdana;"> and </span><i><span style="font-family:Verdana;">in vivo</span></i><span style="font-family:Verdana;">) were tested on </span><i><span style="font-family:Verdana;">Venturia inaequalis</span></i><span style="font-family:Verdana;"> to assay sensitivity of populations treated with the SDHI penthiopyrad, fluxapyroxad and fluopyram that showed a field poor control in an experimental Centre. In comparison, sensible populations were tested. </span><i><span style="font-family:Verdana;">I</span></i><i><span style="font-family:Verdana;">n vitro</span></i><span style="font-family:Verdana;"> trials, the poorly controlled populations presented moderate increases of EC</span>_{<span style="font-family:Verdana;">50</span>}<span style="font-family:Verdana;"> and RF values in all three years in which tests were carried out. The </span><i><span style="font-family:Verdana;">in vivo</span></i><span style="font-family:Verdana;"> trials in glasshouse showed that the activity of SDHI fungicides on field poorly controlled populations was highly reduced. These populations can be defined as “resistant” as the high loss of sensitivity and activity were repeatedly assessed in field and glasshouse. Trials showed that these reductions were manifested by curative applications and not by preventive ones, as already ascertained for </span><i><span style="font-family:Verdana;">V. inaequalis </span></i><span style="font-family:Verdana;">populations resistant to AP and DMI fungicides. </span><span><span style="font-family:Verdana;">The cross-resistance of resistant populations to the three SDHIs was highly positive among them. In bibliography, there are only researches of cross-resistance among SDHIs starting from isolates resistant to boscalid, with results of different sensitivities and cross-resistance. These results with populations of </span><i><span style="font-family:Verdana;">V. inaequalis</span></i><spanBiological methodologies (</span><i><span style="font-family:Verdana;">in vitro</span></i><span style="font-family:Verdana;"> and </span><i><span style="font-family:Verdana;">in vivo</span></i><span style="font-family:Verdana;">) were tested on </span><i><span style="font-family:Verdana;">Venturia inaequalis</span></i><span style="font-family:Verdana;"> to assay sensitivity of populations treated with the SDHI penthiopyrad, fluxapyroxad and fluopyram that showed a field poor control in an experimental Centre. In comparison, sensible populations were tested. </span><i><span style="font-family:Verdana;">I</span></i><i><span style="font-family:Verdana;">n vitro</span></i><span style="font-family:Verdana;"> trials, the poorly controlled populations presented moderate increases of EC</span>_{<span style="font-family:Verdana;">50</span>}<span style="font-family:Verdana;"> and RF values in all three years in which tests were carried out. The </span><i><span style="font-family:Verdana;">in vivo</span></i><span style="font-family:Verdana;"> trials in glasshouse showed that the activity of SDHI fungicides on field poorly controlled populations was highly reduced. These populations can be defined as “resistant” as the high loss of sensitivity and activity were repeatedly assessed in field and glasshouse. Trials showed that these reductions were manifested by curative applications and not by preventive ones, as already ascertained for </span><i><span style="font-family:Verdana;">V. inaequalis </span></i><span style="font-family:Verdana;">populations resistant to AP and DMI fungicides. </span><span><span style="font-family:Verdana;">The cross-resistance of resistant populations to the three SDHIs was highly positive among them. In bibliography, there are only researches of cross-resistance among SDHIs starting from isolates resistant to boscalid, with results of different sensitivities and cross-resistance. These results with populations of </span><i><span style="font-family:Verdana;">V. inaequalis</span></i><span

关 键 词：Venturia inaequalis SDHI Fungicides Scab Control Sensitivity METHODOLOGY 

分 类 号：O17[理学—数学]