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<p>A significant challenge in managing scabs in susceptible apple cultivars is the high potential of <i>Venturia inaequalis</i> to develop resistant populations, owing to the frequent application of site-specific fungicides. Introducing oxidizing compounds into the spray regimen can slow the development of resistance while enhancing the effectiveness of apple scab control. The objective of this study was to evaluate the effectiveness of acetic acid (AA) and AA + peracetic acid (PA), both applied isolated and in combination with commercial fungicides, with or without pH correction by calcium carbonate (CC), in controlling apple scab in ‘Gala’ apple trees. Five trials were conducted in which AA and AA + PA were applied alone or in combination with fungicides as preventive (Trial III), curative (Trials I and II), or eradicating (Trials IV and V) treatments. In Trial III, the incidence of scabs on leaves and fruits was similar between the AA + PA and control treatments. In Trial II, scab severity was lower with the AA + difenoconazole + sodium hydroxide treatment than with the control. In Trial I, the addition of AA to dodine significantly reduced the incidence of scabs on both the leaves and fruits. In Trials IV and V, the addition of AA and AA + PA to dodine enhanced the fungicide-eradicating effect. The application of AA or AA + PA (isolated) did not prevent the establishment of apple scabs caused by <i>V. inaequalis</i>. However, adding AA to dodine, with or without pH correction with CC, and adding AA and CC to difenoconazole reduced the incidence of apple scab on leaves. This approach may reduce the likelihood that resistant <i>V. inaequalis</i> populations will develop. Furthermore, AA and AA + PA may be recommended as eradication treatments in orchards with management failures during the production cycle.</p>

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Integrating acetic, peracetic acids, and calcium carbonate into fungicide programs for apple scab management

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Tiago Miqueloto,
  • Felipe Augusto Moretti Ferreira Pinto,
  • James Matheus Ossacz Laconski,
  • Paulo Henrique da Silva Nogueira,
  • Leonardo Araujo

摘要

A significant challenge in managing scabs in susceptible apple cultivars is the high potential of Venturia inaequalis to develop resistant populations, owing to the frequent application of site-specific fungicides. Introducing oxidizing compounds into the spray regimen can slow the development of resistance while enhancing the effectiveness of apple scab control. The objective of this study was to evaluate the effectiveness of acetic acid (AA) and AA + peracetic acid (PA), both applied isolated and in combination with commercial fungicides, with or without pH correction by calcium carbonate (CC), in controlling apple scab in ‘Gala’ apple trees. Five trials were conducted in which AA and AA + PA were applied alone or in combination with fungicides as preventive (Trial III), curative (Trials I and II), or eradicating (Trials IV and V) treatments. In Trial III, the incidence of scabs on leaves and fruits was similar between the AA + PA and control treatments. In Trial II, scab severity was lower with the AA + difenoconazole + sodium hydroxide treatment than with the control. In Trial I, the addition of AA to dodine significantly reduced the incidence of scabs on both the leaves and fruits. In Trials IV and V, the addition of AA and AA + PA to dodine enhanced the fungicide-eradicating effect. The application of AA or AA + PA (isolated) did not prevent the establishment of apple scabs caused by V. inaequalis. However, adding AA to dodine, with or without pH correction with CC, and adding AA and CC to difenoconazole reduced the incidence of apple scab on leaves. This approach may reduce the likelihood that resistant V. inaequalis populations will develop. Furthermore, AA and AA + PA may be recommended as eradication treatments in orchards with management failures during the production cycle.