Hosta crown and crown (petiole) rot treatment. If your hosta has petiole rot, the first thing to do is to remove the diseased petioles along with the leaves. Just don’t leave them rotting in your yard. Instead, throw them in the trash. Next, clean all traces of fungus from the ground near the hosta (mycelium, granules, and all rotten tissue).

Hosta petiole rot, caused by the fungus Sclerotium rolfsii. This disease has long been a scourge of hosta and other plants in the high temperatures of the southern U.S.. It lives in the soil and attacks the crown (the part of the plant at the soil line). The fallout of its attack is yellowing, browning leaves and mushy, rotted crowns.

Petiole rot, or crown rot, is a fungal disease that can be particularly dangerous for plants. This condition is caused by a fungus known as fusarium, which can cause the roots of the plant to rot from within.

Feb 15, 2025 · Petiole rot stands as one of the most formidable adversaries of the hosta, capable of swiftly decimating the plant. Thus, the key to success lies in prevention and early detection. The spores of this fungus can remain dormant in the soil for …

May 13, 2022 · Bacterial soft rot impacts the stems (technically called petioles) and the lowest leaves on the plant. These will turn soft and mushy. If you kneel down and take a big whiff, you’ll notice a rotten smell.

Jul 15, 2009 · Petiole rot is a very serious disease of hosta caused by the fungus Sclerotium rolfsii var. delphinii. The fungus has a very wide host range, so it can be a problem on many garden plants. Disease symptoms on hosta start as marginal yellowing and …

Jun 2, 2015 · Formerly known as hosta crown rot, petiole rot is a serious fungal disease. Signs: Yellowing and browning of the leaves around the margins, leaves become limp and mushy at the base of their petiole (leaf stem).

Originally called hosta crown rot, this is caused by a fungal pathogen called Sclerotium rolfsii var. delphinii and it’s serious. To prevent petiole rot, move any mulch away from the stem of the plant and maintain good watering practices.

Petiole rot Petiole rot, caused by Sclerotium rolfsii var. delphinii, can rapidly damage or kill hosta plants and is difficult to eradicate. Small spheres produced by the fungus, called sclerotia, are about the same size as mustard seeds (Figs. 4, 5). These tiny spheres allow the fungus to survive cold winters and dry-weather periods. When warm ...

Apr 19, 2021 · When you see yellowing leaves on hosta, the plant may have petiole rot, caused by the fungus Sclerotium rolfsii var. delphinii. The earliest symptoms are yellowing and browning of the lower leaf margins.