VPG FE11378 32OZ CONC FUNGICIDE FE11378

Will this help control mushrooms in the lawn?

Anyone know why I should pay $30 for 1.55% instead of paying $45 for 14.3% propiconazole (i.e. 50% more $ for 922% more propiconazole)?

I'm losing my magnolia seedlings to Black Leaf. Will this work for that?

What is the application method?