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<p>Irregular bearing is a&#xa0;significant challenge in apple production that leads to inconsistent yields and economic losses. This study investigated the efficacy of paclobutrazol (PBZ) application in mitigating irregular bearing in ‘Red Delicious’ apple trees. Six treatments (Control and PBZ at 1.5 g, 2.25 g, 3.0 g, 3.75 g, and 4.5 g active ingredient [a.i.] per tree) were evaluated in a&#xa0;randomized complete block design with four replications over 2&#xa0;consecutive years (2022–2023 and 2023–2024). Results demonstrated that PBZ application significantly improved return bloom percentage, fruit retention, and yield parameters while reducing fruit drop. The highest concentration (PBZ@4.5 g&#xa0;a.i.) consistently produced superior results across both locations, with return bloom increasing up to 77.49%, fruit retention reaching 87.88%, and fruit drop decreasing to 8.61% compared to control trees. Fruit yield increased by 74% and 92%, respectively, with corresponding improvements in yield efficiency and fruit weight. Principal component analysis revealed that 92.9% and 96.1% of variance at the two locations was explained by the first principal component, with fruit drop negatively correlated and other yield parameters positively correlated with this component. This research supports the use of soil-applied PBZ to effectively regulate irregular bearing in apple trees, offering a&#xa0;solution for stabilizing production and improving economic outcomes.</p>

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Mitigating Irregular Bearing in Apple Using Paclobutrazol: A Field Study on the ‘Red Delicious’ Cultivar in Different Agroecosystems

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Mansha Gul,
  • B. K. Sinha,
  • Gurdev Chand,
  • Amit Khokher,
  • M. Iqbal Jeelani

摘要

Irregular bearing is a significant challenge in apple production that leads to inconsistent yields and economic losses. This study investigated the efficacy of paclobutrazol (PBZ) application in mitigating irregular bearing in ‘Red Delicious’ apple trees. Six treatments (Control and PBZ at 1.5 g, 2.25 g, 3.0 g, 3.75 g, and 4.5 g active ingredient [a.i.] per tree) were evaluated in a randomized complete block design with four replications over 2 consecutive years (2022–2023 and 2023–2024). Results demonstrated that PBZ application significantly improved return bloom percentage, fruit retention, and yield parameters while reducing fruit drop. The highest concentration (PBZ@4.5 g a.i.) consistently produced superior results across both locations, with return bloom increasing up to 77.49%, fruit retention reaching 87.88%, and fruit drop decreasing to 8.61% compared to control trees. Fruit yield increased by 74% and 92%, respectively, with corresponding improvements in yield efficiency and fruit weight. Principal component analysis revealed that 92.9% and 96.1% of variance at the two locations was explained by the first principal component, with fruit drop negatively correlated and other yield parameters positively correlated with this component. This research supports the use of soil-applied PBZ to effectively regulate irregular bearing in apple trees, offering a solution for stabilizing production and improving economic outcomes.