Department of Plant Protection Biology, Swedish University of Agricultural Sciences, Alnarp, SE-230 53, Sweden.
Plant Dis. 2020 Nov;104(11):3026-3032. doi: 10.1094/PDIS-11-19-2296-RE. Epub 2020 Aug 24.
Currently available fungicides against potato late blight are effective but there are concerns about the sustainability of frequent applications and the risks of fungicide resistance. Therefore, we investigated how potassium phosphite can be integrated into late blight control programs with reduced fungicides in field trials. Phosphite was somewhat less effective than the conventional fungicides at suppressing late blight in the foliage, and the tubers contained less starch. However, when we reduced the amount of phosphite and combined it with reduced amounts of conventional fungicides, we observed no differences in disease suppression, total yields, and tuber starch contents compared with the full treatments with conventional fungicides. The amount of phosphite detected in the harvested tubers was linearly associated with the amount of phosphite applied to the foliage. Our analyses indicate that phosphite could replace some fungicides without exceeding the current European Union standards for the maximum residue levels in potato tubers. No phosphite was detected in the starch from the tubers. In 1 of 2 years, early blight (caused by ) was less severe in the phosphite treatments than in the treatments without phosphite. The integration of phosphite into current treatment strategies would reduce the dependence on conventional fungicides.
目前可用的防治马铃薯晚疫病的杀菌剂是有效的，但人们担心频繁使用会带来可持续性问题，并且担心杀菌剂抗性的风险。因此，我们在田间试验中研究了亚磷酸钾如何与减少杀菌剂一起整合到晚疫病防治计划中。亚磷酸在抑制叶片晚疫病方面的效果略逊于常规杀菌剂，而且块茎中淀粉含量较低。然而，当我们减少亚磷酸的用量并将其与减少常规杀菌剂的用量结合使用时，与使用常规杀菌剂的全剂量处理相比，我们观察到在疾病抑制、总产量和块茎淀粉含量方面没有差异。收获的块茎中检测到的亚磷酸量与施用于叶片的亚磷酸量呈线性相关。我们的分析表明，亚磷酸可以替代一些杀菌剂，而不会超过欧盟目前对马铃薯块茎中最大残留限量的标准。在块茎的淀粉中没有检测到亚磷酸。在 2 年中的 1 年中，亚磷酸处理的早疫病（由 引起）比没有亚磷酸处理的早疫病严重程度较轻。将亚磷酸纳入当前的治疗策略将减少对常规杀菌剂的依赖。
