Baking soda probably represses some fungi. That was a folk
remedy for powdery mildew (baking soda in water), for example.
What would eat powdered milk? Lactobacilli, for one thing.
Maybe it outcompetes some disease-causing organisms
if it has an ample supply of food?
Late Blight is pretty virulent, though. Lactobacilli would have
to be abundant on the foliage to even have a chance against
it. Abundant lactobacilli on/in the soil will not prevent it. Will
lactobacilli also eat fungal spores that land on the foliage
(as well as milk) if it is there? I don't know.
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