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<p>Peach powdery mildew caused by <i>Podosphaera pannosa</i> (Wallr.: Fr.) de Bary (syn. <i>Sphaerotheca pannosa</i>) is a major fungal disease in peach orchards of Iran. During the 2023–2024 growing seasons, a commercial orchard planted with the local cultivar ‘Zafarani’, with a history of severe powdery mildew infection, located in the Zayandeh Rood region, was selected to evaluate the integrated effects of green pruning and fungicide applications on disease management. Two fungicide mixtures were tested: pydiflumetofen + difenoconazole (Miravis Duo<sup>®</sup> SC, 20%), applied at 0.0002 (2&#xa0;ml/10 L), and kresoxim-methyl + boscalid (Collis<sup>®</sup> SC, 20/10%), applied at 0.0003 (3&#xa0;ml/10 L), respectively. The experiment was arranged as a randomized complete block design with six treatments and five replicates, including an untreated control, green pruning alone, individual fungicide applications, and combined fungicide and green pruning treatments. Fungicides were applied five weeks after full petal fall, while green pruning in the combined treatments was performed one day prior to fungicide application. The treatments significantly affected disease incidence and severity on both leaves and fruits (P ≤ 0.01). The highest disease incidence was recorded in the untreated control (71.6%), whereas the lowest incidence was observed in Miravis Duo<sup>®</sup> combined with green pruning (1.8% on leaves and 0.4% on fruits). Fruit disease severity in the combined treatment (Miravis Duo<sup>®</sup> application plus green pruning) was significantly reduced to less than 0.005, compared to approximately 1.7 in the control group. The integrated use of green pruning and Miravis Duo<sup>®</sup> demonstrated a statistically supported synergistic effect. The interaction term in the two-way ANOVA (fungicide × green pruning) was significant (p &lt; 0.01), confirming that the combined treatment produced a greater reduction in disease severity than either factor alone. Under field conditions in the Zayandeh Rood region, this combined strategy reduced fruit disease severity to &lt; 0.005, compared with 1.7 in the untreated control, corresponding to an approximately 99% reduction in disease incidence.</p>

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Integrated control of peach powdery mildew using green pruning and fungicides in Iran

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Naser Amanifar

摘要

Peach powdery mildew caused by Podosphaera pannosa (Wallr.: Fr.) de Bary (syn. Sphaerotheca pannosa) is a major fungal disease in peach orchards of Iran. During the 2023–2024 growing seasons, a commercial orchard planted with the local cultivar ‘Zafarani’, with a history of severe powdery mildew infection, located in the Zayandeh Rood region, was selected to evaluate the integrated effects of green pruning and fungicide applications on disease management. Two fungicide mixtures were tested: pydiflumetofen + difenoconazole (Miravis Duo® SC, 20%), applied at 0.0002 (2 ml/10 L), and kresoxim-methyl + boscalid (Collis® SC, 20/10%), applied at 0.0003 (3 ml/10 L), respectively. The experiment was arranged as a randomized complete block design with six treatments and five replicates, including an untreated control, green pruning alone, individual fungicide applications, and combined fungicide and green pruning treatments. Fungicides were applied five weeks after full petal fall, while green pruning in the combined treatments was performed one day prior to fungicide application. The treatments significantly affected disease incidence and severity on both leaves and fruits (P ≤ 0.01). The highest disease incidence was recorded in the untreated control (71.6%), whereas the lowest incidence was observed in Miravis Duo® combined with green pruning (1.8% on leaves and 0.4% on fruits). Fruit disease severity in the combined treatment (Miravis Duo® application plus green pruning) was significantly reduced to less than 0.005, compared to approximately 1.7 in the control group. The integrated use of green pruning and Miravis Duo® demonstrated a statistically supported synergistic effect. The interaction term in the two-way ANOVA (fungicide × green pruning) was significant (p < 0.01), confirming that the combined treatment produced a greater reduction in disease severity than either factor alone. Under field conditions in the Zayandeh Rood region, this combined strategy reduced fruit disease severity to < 0.005, compared with 1.7 in the untreated control, corresponding to an approximately 99% reduction in disease incidence.