Knowledgebase

Lilac issues #878571

Asked July 24, 2024, 12:47 PM EDT

Lilac leaves are turned brown but now have noticed new growth on plants What causes the leaves to die and then started regrowing What do I need to do

Ramsey County Minnesota

Expert Response

It is probably bacterial blight of lilac. It is rampant this year, promoted by the wet weather.
Management.
https://extension.umn.edu/plant-diseases/leaf-spot-diseases-trees-and-shrubs#bacterial-leaf-spots-1156513
https://www.canr.msu.edu/news/bacterial_blight_of_lilac

https://yardandgarden.extension.iastate.edu/encyclopedia/lilac-bacterial-blight

https://hort.extension.wisc.edu/articles/bacterial-blight/

https://extension.psu.edu/lilac-diseases

http://plantclinic.cornell.edu/factsheets/lilacbacterialblight.pdf

https://www.rhs.org.uk/disease/lilac-blight

Evelyn Locke, MN Master Gardener, Tree Care Advisor, Volunteer Replied July 24, 2024, 1:15 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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