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Powdery Mildew #877675

Asked July 17, 2024, 4:24 PM EDT

My cucumbers fell victim to powdery mildew and I lost the battle. I’ve never had this issue before but the plants died after some failed attempts to save them (Neem oil spray and a peroxide/water mixture). After clearing out the bed, do I need to do anything to the in-ground soil before replanting? I had 4 cucumbers planted next to 4 green beans and 2 tomatoes in the same bed. I had hoped to still be able to replant something this month.

Anoka County Minnesota

Expert Response

Thank you for writing.
It sounds like your plants are a bit crowded but I need a picture to know.
I have to take your word on mildew  https://extension.umn.edu/disease-management/powdery-mildew-cucurbits  It is a fungal condition of excess water, crowding and poor ventilation.  Plants that are on the ground as opposed to on mulch or suspended on trellises are at particular risk.
It is not caused by insects--neem oil is of no value and can burn leaves making the plant susceptible to more damage. 

No special bed prep is needed. 
Plant away but adjust spacing, reduce watering, and elevate/stake plants. 
Steve Miles, Master Gardener, Hennepin County MN (I am a human being, not a bot nor AI). I am an avid gardener but am not a degreed or certified horticulturist or arborist. I am happy to receive follow-up questions if my responses are incomplete or unclear.  This is the University of MN' garden soil testing service.  https://soiltest.cfans.umn.edu/testing-services/lawn-garden This is guidance on how to find a tree expert.  https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional 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 Replied July 17, 2024, 5:14 PM EDT

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