Knowledgebase
White spots turn black on leaves #938472
Asked July 07, 2026, 10:55 PM EDT
Dakota County Minnesota
Expert Response
https://ask.extension.org/kb/faq.php?id=582400
https://extension.umn.edu/yard-and-garden-insects/leafminers
https://hort.extension.wisc.edu/articles/leafminers-vegetables/
Submitting a sample to the Plant Disease Clinic for a fee would give you a definite diagnosis. https://pdc.umn.edu/