Occurrence factors and corrective measures on "Flower Bud Blackening Disorder" in 'Shine Muscat' grape
2020
Mochida, K. | Nagashima, S.
We investigated the cause, circumstances for occurrence, and counter-measures for "flower bud blackening disorder" occurring in 'Shine Muscat' grape from the 7th leafing stage to the flowering period, using both heated and unheated cultivation for comparison. The main cause of "flower bud blackening disorder" was not grape ripe rot. Significantly more occurrences of "flower bud blackening disorder" were found in the tree grafting on invigorating rootstock than on the semi-dwarfing rootstock. Almost no occurrence was observed in a vineyard equipped with a drip fertigation system and a mulching cover on the soil surface. Regardless of the humidity around the flower cluster, "flower bud blackening disorder" occurred in a plot which had heavy watering. A large number of flower clusters that had "flower bud blackening disorder" also had subsequent flower shatter. The shoots with "flower bud blackening disorder" had a high volumetric water content, and water droplets were observed in the flower buds. Based on these findings, "flower bud blackening disorder" is considered to be a physiological disorder caused by condensation in the flower buds when root water absorption is very vigorous during a period of one month or less prior to the flowering.
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