Powdery Mildew On My Pumpkin Leaves - Ask Extension
I have been growing a small patch of pumpkins at my house in Eagan and every year most of the leaves get a lot of white powdery mildew on them. I do n...
Knowledgebase
Powdery Mildew On My Pumpkin Leaves #924940
Asked February 23, 2026, 1:04 PM EST
I have been growing a small patch of pumpkins at my house in Eagan and every year most of the leaves get a lot of white powdery mildew on them. I do not water the leaves but I do have a 10 minute spritz of water each day on the pumpkin mounds in the raised garden portion. I have tried fungicide but it doesn't seem to help and the spread is too large. I am including a picture of my mini-patch of pumpkins. Please advise if there is something I can do to minimize this mildew. Thank you
Dakota County Minnesota
Expert Response
These web pages may be helpful.
https://www.canr.msu.edu/uploads/files/powdery_mildew.pdf
https://ask.extension.org/kb/faq.php?id=804392#:~:text=If%20conditions%20are%20still%20favorable,effective%20as%20oil%20or%20sulfur.
Scroll down to the Powdery mildew section.
https://extension.okstate.edu/fact-sheets/pumpkin-and-squash-diseases.html#:~:text=may%20be%20effective.-,Powdery%20mildew,increase%20once%20it%20becomes%20established.
https://www.canr.msu.edu/uploads/files/powdery_mildew.pdf
https://ask.extension.org/kb/faq.php?id=804392#:~:text=If%20conditions%20are%20still%20favorable,effective%20as%20oil%20or%20sulfur.
Scroll down to the Powdery mildew section.
https://extension.okstate.edu/fact-sheets/pumpkin-and-squash-diseases.html#:~:text=may%20be%20effective.-,Powdery%20mildew,increase%20once%20it%20becomes%20established.
