Ask a Question forum: Fungus or What?

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Remer, Minnesota
Aug 21, 2017 4:44 PM CST
I've been asked to try to find out what is causing the white blotches on this plant. The photo was taken in Northern Minnesota. Is it a fungus or something else? Any information will be greatly appreciated.

Thumb of 2017-08-21/BSquared18/35761e

Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Aug 21, 2017 4:55 PM CST
It's caused by a leafminer. Since the plant is poison ivy presumably it is the larvae of the poison ivy leafminer moth:

Edited to add pictures of the mines:
[Last edited by sooby - Aug 21, 2017 4:56 PM (+)]
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Remer, Minnesota
Aug 21, 2017 6:37 PM CST
Thank you for your quick response.

I forwarded the information to my wife, who asked me to find out the cause.


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