Do you spray directly to the spinash leaves or to the soil, thanks
Certified GKH Gardening Expert
Both can be done! Spray the leaves, and the soil. You can also spray the leaves, but use a mixture of DOLOMITIC LIME and WETTABLE SULFUR in the soil instead.This can work as well.
This article will give you more information on fungicides: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm