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Lilacs black on leaves and shriveling up #877550

Asked July 16, 2024, 8:24 PM EDT

Lilacs in yard all turning black on leaves and shriveling up is this now time to take the trees out or heavily prune

Hennepin County Minnesota

Expert Response

Thank you for writing.
The brief description sounds like bacterial lilac blight but I cannot be sure.

chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/http://plantclinic.cornell.edu/factsheets/lilacbacterialblight.pdf

To confirm the diagnosis, you should send a sample to the University Plant Disease Clinic https://pdc.umn.edu/

Steve Miles, Master Gardener, Hennepin County, (I am a volunteer human being: not a bot, not AI). I'm an avid gardener but not a degreed or certified horticulturist or arborist. I will do much better if you also send a photograph. I like follow-up questions. The University' garden soil tests are excellent. https://soiltest.cfans.umn.edu/testing-services/lawn-garden This is how to find a tree expert. https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional A Directory of ISA certified arborists is at https://certificates.directory.isa-arbor.com/ The Minnesota Landscape Arboretum is a wonderful place to see and learn about plants that grow in Minnesota. https://mngardens.horticulture.umn.edu/minnesota-landscape-arboretum Ask a Master Gardener is a public service of the University of MInnesota's Extension Division. Please donate if we make you happy. https://give.umn.edu/gardener Replied July 17, 2024, 12:20 AM EDT

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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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