Phil from Livonia Township, Mn writes
The hosta will grow up and about this time of year the leaves start to fall off and then they will regrow. From photos I have seen it is crown rot/southern blight.
Clearys 3336 DG Lite Granular Fungicide is not specifically labeled for crown rot.
We would recommend using Monterey Agri-Fos Systemic Fungicide is labeled for crown rot and can be used on ornamentals. You will use 1 tsp.-2 oz. per gallon of water. It can be used as a foliar spray, soil drench, soil incorporation, basal bark application and bare root dip.
Answer last updated on: 06/17/2015