Effects of Site of Application of Ethychlozate on Flower Thinning in ‘Campbell Early’ Grapes

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  • エチクロゼートの処理部位と摘粒効果
  • ブドウ"キャンベル・アーリー"におけるエチクロゼートの処理部位と摘粒効果
  • ブドウ キャンベル アーリー ニ オケル エチクロゼート ノ ショリ ブイ ト
  • Effects of Site of Application of Ethychlozate on Flower Thinning in ^|^lsquo;Campbell Early^|^rsquo; Grapes

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The effects of site of application of ethyl-5-chloro-1 H-indazol-3-acetic acid (ethychlozate) on flower abscission were studied in 17-year-old ‘Campbell Early’ grapevines. Ethychlozate at 50 and 75ppm was applied at full bloom by dipping flower clusters or by spraying, either leaves or leaves plus flower clusters.<br>When ethychlozate was used as a spray, it effectively promoted flower abscission at both concentrations. However, there was a marked increase in the set of small seedless berries (shot berries) in cluster-treated vines, and numbers of normal berries were greatly reduced.<br>Ethychlozate induced greater flower abscission at the distal end of the 3rd spikelet than at the proximal end of the cluster.<br>Peaks of flower abscission appeared 7 to 8 days after treatment in both untreated and leaf-treated vines. The peak was delayed by about 2 days in leaf plus cluster-treated vines, and by about 5.5 days in cluster-treated ones.<br>In both spray treatments, the shoot tip and leaves began to wilt several hours after treatment, but recovered after about 7 days. Ethychlozate appears to cause flower thinning at the same time as recovery from wilting in the shoot tip.

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