Technique in Flowering Period for Reducing Berry Cracking and Pericarp Cracking Symptom of ‘Ruby-Roman’ Grape

Hayakawa Takahiro, Matsuda Kenichi, Tamamura Souta, Nakano Shinichi, Nakamura Fumiya

doi:10.2503/hrj.17.27

<p>We investigated the effect of removal of flower lees (mainly corolla) using a hand “corolla winder” and the methods of gibberellin treatment on berry cracking of ‘Ruby-Roman’ grape. The rates of rust fruit and berry cracking were significantly lower in the treatment group when all the corollas were completely removed from the ovary on the day of full bloom than the control (unremoved) treatment group. There was no differences in rate of rust fruit or berry cracking between the treatments when all the corollas were completely removed from the flowers and another treatment whereby the corollas were removed using the “corolla winder” in about 10 windings. The results demonstrate that the removal of flower lees using a hand ‘corolla winder’ can reduce the occurrence of berry cracking as a labor-saving method. On the other hand, the method of gibberellin treatment had no effect on the rate of berry cracking. However, when the rate of pericarp cracking was significantly lower in the treatment group when the 2nd gibberellin treatment was conducted at an early rather than late stage. Furthermore, the rate of pericarp cracking was significantly lower with the single treatment of gibberellin than with the two-times treatment. From these results, we conclude that the removal of the flower lees using the “corolla winder” is effective for reducing berry cracking of ‘Ruby-Roman’ grape, and that single gibberellin treatment can reduce the rate of pericarp cracking.</p>

Technique in Flowering Period for Reducing Berry Cracking and Pericarp Cracking Symptom of ‘Ruby-Roman’ Grape

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