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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.
Lack of fruitset Left, high temperatures during bloom greatly reduced fruitset on this cluster.
Photo: T. Zabadal
Lack of fruitset 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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Funding for this web site provided by Project GREEEN, American Farmland Trust, EPA Region 5's Strategic Agricultural Initiative program, The National Foundation for IPM Education, the Center for Agricultural Partnerships and the MSU Integrated Pest Management Program
in collaboration with MSU Extension and the Michigan Agricultural Experiment Station.
Updated 12/20/07 Contact: J.N. Landis.