A panel of 48 of Italian rice varieties recently released and mostly included in the Common Catalogue of Agricultural Species was evaluated for susceptibility to panicle blast disease (Magnaporthe oryzae B. Couch) in open field conditions. Trials were performed under highly favourable conditions for the pathogen, and visual assessments focused on the severity and incidence of panicle blast symptoms. Only 8% of newly released varieties were classified as resistant, whereas 40% were highly susceptible. Our results confirmed that a fungicide treatment with tricyclazole at booting stage reduces the disease incidence and severity and that the effect is measurable up to 6 weeks after treatment. A double application of tricyclazole at stem elongation and booting stage was more effective than the single application. This study provides ready-to-use information to support rice growers in variety choice and planning of plant protection strategies, as well as public institutions in the emanation of guidelines for integrated pest management.

评估了一组最近发布的48种意大利稻米品种，这些稻米大部分被纳入《农业物种共同目录》，以评估其对穗瘟病的敏感性（Magnaporthe oryzaeB. Couch）在开阔的野外条件下。试验是在对病原体高度有利的条件下进行的，目视评估集中在穗瘟症状的严重程度和发生率上。新发行品种中只有8％被归为抗药性，而40％为高度易感。我们的结果证实，在启动阶段用三环唑进行杀菌剂处理可以降低疾病的发病率和严重程度，并且在治疗后长达6周的效果是可以衡量的。在茎伸长和启动阶段两次施用三环唑比单次施用更有效。这项研究提供了现成的信息，以支持水稻种植者进行品种选择和植物保护策略的规划，以及为公共机构制定综合虫害管理准则提供支持。