Research on Dithianon to Evaluate Suspects of Reduced Sensitivity of <i>Venturia inaequalis</i>with Different Methodologies in Italian Apple Areas

• 作者: Fiaccadori Riccardo
• 来源期刊: 美国植物学期刊(英文)
• 学科: 数学
• 关键词: Venturia inaequalis Sensitivity Dithianon Apple Scab Control Reduced Control
• 年，卷（期）: 2021,（3）
• 页码范围: 406-416
• 页数: 11页
• 分类号: O17

摘要

Dithianon is a multi-site fungicide and has never been object of suspects and reports of reduced sensitivity and activity. Italian IFP technicians had the suspect of reductions of activity by this fungicide on </span><i><span style="font-family:Verdana;">Venturia inaequalis.</span></i><span style="font-family:Verdana;"> 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 carried out to verify this suspect. Populations poorly controlled with suspects on dithianon and sensible ones </span><span><span style="font-family:Verdana;">were utilized. The tests </span><i><span style="font-family:Verdana;">in vitro</span></i><span style="font-family:Verdana;"> permitted to evidence light and non-significant</span></span><span style="font-family:Verdana;"> reductions of sensitivity of poorly controlled populations </span></span><span style="font-family:Verdana;">with </span><span style="font-family:Verdana;">respect </span><span style="font-family:Verdana;">to </span><span style="font-family:""><span style="font-family:Verdana;">sensible ones. </span><i><span style="font-family:Verdana;">In vivo tests</span></i><span style="font-family:Verdana;"> on seedlings were non</span></span><span style="font-family:Verdana;">-</span><span style="font-family:""><span style="font-family:Verdana;">reliable for a general low activity of dithianon. On the contrary, the original </span><i><span style="font-family:Verdana;">in vivo</span></i><span style="font-family:Verdana;"> methodology on grafted apple plants showed several reductions of activity, with moderate levels and a spot distribution in orchards. The cause was probably due to the increase</span></span><span style="font-family:Verdana;">d</span><span style="font-family:Verdana;"> treatments with dithianon caused by problems on other groups of fungicides and by a high infective pressure in some years. It is discuss