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<p>This research investigated the effects of leaf removal under the first cluster before flowering, leaf removal under the second cluster at fruit set, cluster thinning at a&#xa0;0.25 rate before flowering and at fruit set, and topping of varying severity at fruit set on the ‘Alphonse Lavallée’ grape cultivar. The experiment was established as a&#xa0;completely randomized block in a&#xa0;split–split plot design. Variance analysis for split–split or split plots was performed using the R&#xa0;statistical program. Means were grouped using the F&#xa0;test (<i>p</i> ≤ 0.05), as only two groups were compared. Leaf removal treatments did not affect yield. In vines subjected to leaf removal before flowering (LRbf), cluster thinning at a&#xa0;0.25 rate increased cluster weight compared with the unthinned control. In vines with leaf removal at fruit set (LRfs), cluster thinning at a&#xa0;0.25 rate increased chroma values, while light topping increased berry firmness. Compared with other leaf removal treatments, LRfs increased total phenols and berry weight. In both leaf removal timings, cluster thinning increased berry weight, and light topping increased total soluble solids (TSS). Based on these findings, it is recommended to remove leaves and secondary shoots under the second cluster at fruit set, apply cluster thinning at a&#xa0;0.25 rate, and perform light topping at 40 cm above the upper wire.</p>

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The Effects of Leaf Removal, Cluster Thinning and Topping Applications on Yield and Quality of ‘Alphonse Lavallée’ Grape Cultivar

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Mustafa Celik,
  • Metin Akural

摘要

This research investigated the effects of leaf removal under the first cluster before flowering, leaf removal under the second cluster at fruit set, cluster thinning at a 0.25 rate before flowering and at fruit set, and topping of varying severity at fruit set on the ‘Alphonse Lavallée’ grape cultivar. The experiment was established as a completely randomized block in a split–split plot design. Variance analysis for split–split or split plots was performed using the R statistical program. Means were grouped using the F test (p ≤ 0.05), as only two groups were compared. Leaf removal treatments did not affect yield. In vines subjected to leaf removal before flowering (LRbf), cluster thinning at a 0.25 rate increased cluster weight compared with the unthinned control. In vines with leaf removal at fruit set (LRfs), cluster thinning at a 0.25 rate increased chroma values, while light topping increased berry firmness. Compared with other leaf removal treatments, LRfs increased total phenols and berry weight. In both leaf removal timings, cluster thinning increased berry weight, and light topping increased total soluble solids (TSS). Based on these findings, it is recommended to remove leaves and secondary shoots under the second cluster at fruit set, apply cluster thinning at a 0.25 rate, and perform light topping at 40 cm above the upper wire.