Crown The woody rootstock that stores the energy for the dormant hosta. Usually evident in a hosta with 3 or more eyes (see definition below). Hostas are divided by splitting the crown to leave one or more eyes in each piece. Officially, the crown may be called a rhizome, but never a bulb.Click to see full answer. Moreover, how do you get rid of crown rot on hostas?Rhizomes or bulbs can be treated with hot water to eliminate the fungus. Soil drenches of fungicides (Cleary’s 3336, Terraclor) around the base of plants before infection can prevent disease development (but will not cure affected plants).Also Know, what does crown rot look like? Crown rot causes deterioration and rotting of the tissues at the crown of the plant causing the leaves to turn yellow, collapse, and die. Sclerotia, which resemble mustard seeds and vary from white to reddish tan to light brown in color, develop at the base of the plant. Thereof, why are my hostas rotting? Petiole rot is a very serious disease of hosta caused by the fungus Sclerotium rolfsii var. A soft, brown, mushy decay may be seen at the base of the petiole sometimes accompanied by white fungal threads. As the disease progresses the leaves discolor and wilt.How do you treat fungus on hostas?Irrigate plants in a manner that keeps water off the leaves. Apply a fungicide to protect healthy leaves. Leaf stems brown at the soil level as leaves turn yellow, then brown, wilt and die. White fan-like fungal growth at the base of the plant eventually has small, black structures on its surface.