Drench applications of systemic acquired resistance (SAR) inducing compounds acibenzolar-s-methyl (ASM) and thiamethoxam (THIA) may contribute for the control of citrus canker, caused by Xanthomonas citri subsp. citri. Here, we report the results of a 3-year field experiment on the effect of drench applications of two SAR-inducing compounds, applied alone or in combination with copper oxychloride (CuOX) foliar sprays, on citrus canker control, as well as tree growth and yield, of Natal sweet orange trees under Brazilian subtropical conditions. Leaf disease incidence, tree defoliation, and citrus leaf miner (Phyllocnistis citrella) attack were evaluated every 30 days for 16 months. Soil applications of ASM or THIA combined with foliar sprays of CuOX highly reduced citrus canker incidence on leaves. Effective control of the disease, comparable to regular foliar sprays of cupric bactericides, was obtained with two to four drench applications of SAR-inducing compounds. No differences among the treatments were observed in regard to tree height and canopy volume, and fruit yield of the young citrus trees. Soil applications of SAR-inducing compounds proved to be an important measure for the integrate management of citrus canker under the Brazilian subtropical conditions.

中文翻译：

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Acibenzolar-s-methyl和thiamethoxam在亚热带条件下治理柑橘溃疡病的土壤应用

全身获得性抗性 (SAR) 诱导化合物 acibenzolar-s-methyl (ASM) 和噻虫嗪 (THIA) 的淋洗应用可能有助于控制由 Xanthomonas citri subsp. 引起的柑橘溃疡病。柑橘。在这里，我们报告了一项为期 3 年的田间试验结果，该试验表明两种 SAR 诱导化合物单独施用或与氯氧化铜 (CuOX) 叶面喷雾组合施用对柑橘溃疡病控制以及树木生长的影响巴西亚热带条件下纳塔尔甜橙树的产量和产量。在 16 个月内每 30 天评估一次叶病发病率、树木落叶和柑橘潜叶虫（Phyllocnistis citrella）攻击。土壤施用 ASM 或 THIA 结合叶面喷洒 CuOX 大大降低了叶片上柑橘溃疡病的发生率。有效控制病情，与常规叶面喷洒铜杀菌剂相媲美，通过 SAR 诱导化合物的 2 到 4 次淋洒获得。在树高和冠层体积以及柑橘幼树的果实产量方面没有观察到处理之间的差异。在巴西亚热带条件下，土壤中应用 SAR 诱导化合物被证明是柑橘溃疡病综合治理的重要措施。