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Lack
of fruitset
Tom
Zabadal , MSU Horticulture |
| Home > Scouting guide> fruit set |
| Several factors
can cause a lack of fruitset: nutritional deficiencies (see boron),
lack of node fruitfulness caused by weather and vine management
in the previous growing season, extremely hot or cool weather during
bloom, or winter or spring
freeze injury. In addition, herbicide injury, nutritional imbalances
(see bunch stem necrosis) and diseases,
especially botrytis and downy
mildew, may have an effect. |
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Left, high
temperatures during bloom greatly reduced fruitset on this cluster.
Photo: T. Zabadal |
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A bud
cross-section shows the dead primary bud in the middle and
live secondary and tertiary buds on the sides. Cross-sections
of nodes that have been warmed for at least 48 hours can be
used to determine how severely to prune vines in response
to winter injury. Photo:
T. Zabadal |
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