Knowledgebase

Grape Not Ripening #909761

Asked July 14, 2025, 12:30 PM EDT

My grape does great at seedling but not able to ripe, its 3rd year. What could be wrong?

Howard County Maryland

Expert Response

Hi- there is a strong possibility your vines are infected with a common fungal disease, black rot. The disease starts as brown spots on leaves and then moves to developing fruits. Remove and discard all grape "mummies" to reduce the risk of infection next year.

These resources provide detailed information on this disease, including prevention and control practices.

https://extension.psu.edu/black-rot-on-grapes-in-home-gardens

https://plantpathology.ca.uky.edu/sites/plantpathology.ca.uky.edu/files/PPFS-FR-S-16.pdf
Jon

Answered by the Home and Garden Information Center (HGIC), University of Maryland Extension. For timely gardening information and tips, subscribe to our Maryland Grows blog and quarterly newsletter. Follow us on Facebook, Instagram, and YouTube. Replied July 14, 2025, 2:50 PM EDT

This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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