Crown Rot

[Wild Dog]

The links below to crown rot "I" think are incomplete. It refers to crown rot and shows "southern blight" (SB) (Sclerotium Rolfsii). Not that SB will not cause crown rot Sclerotium Rolfsii are not the only sources of the symptom we call "crown rot".

My understanding of crown rot is; symptoms caused by the decay/rot of the crown caused by a variety of problems from the attack of SB to freeze or other damage attacked by a host of organisms, bacteria or fungal.

If one believes that the symptom crown rot is caused by SB and treats for SB when in fact it is other damage leading to bacterial attack then treating for Sclerotium Rolfsii probably won't help and may damage the plant further.

Help, plant pathologist? Shed more light on this question.

Other useful links:
http://www.extension.umn.edu/projects/y ... sta-C.html
http://www.extension.umn.edu/projects/y ... oliar.html

[HostaDesigner]

Without even reading the links yet, I agree that a lot of articles mix the term "crown rot" with southern blight. They are two totally different things in my experience. Rotting of the crown can ultimately kill the plant and turn it to stinky mush—root and all. Southern blight rots away the petioles rapidly, but "generally" allows the crown to push up more eyes (before they rot off too, occasionally ). This is my general observations, or course.

[Homer_Zn5]

The links below to crown rot "I" think are incomplete. It refers to crown rot and shows "southern blight" (SB) (Sclerotium Rolfsii). Not that SB will not cause crown rot Sclerotium Rolfsii are not the only sources of the symptom we call "crown rot".


Other useful links:
http://www.extension.umn.edu/projects/y ... sta-C.html
http://www.extension.umn.edu/projects/y ... oliar.html

The links only lead to a very brief overview of foliar nematodes and a link to general diagnostics of hosta diseases. I don't see any discussion on crown rot or southern blight.

[Wild Dog]

Hostadesigner you get my point exactly. If you looked carefully you will see crown rot and the only reference is to the sclerotia which is spherical sclerotia the little seed looking part of the disease process of rolfsii that is "I think the fungi's propagation method).

[Homer_Zn5]

http://www.extension.umn.edu/projects/y ... sta-s.html

I think this is the link you are looking for. It says
"CROWN ROT
(Occurs occasionally)
Shoots wilt suddenly, stems are mushy. Brown to tan mustard-seed-like sclerotia can be seen on soil and infected area."

I don't think it is meant to be a definitive and complete dissertation on crown rot, since there are only two complete sentences in the publication. I would agree, though, that rot could be either bacterial or fungal (maybe viral, as well, although I don't know of any).

[VThosta/daylilylover]

Other useful links:
http://www.extension.umn.edu/projects/y ... sta-C.html
http://www.extension.umn.edu/projects/y ... oliar.html

I put those links on the forum "What's causing these spots". They were not part of a discussion on crown rot if I remember... I'll have to go look at the rest of the posts on that one. But Homer has the correct site that UMN includes for crown rot.
Another useful link from that same post is:
http://www.extension.iastate.edu/Publications/SUL14.pdf
For crown rot try:
http://www.extension.iastate.edu/publications/sul8.pdf

[Wild Dog]

VT I understood which is why I started another thread!

[VThosta/daylilylover]

I guess I'm the one confused. I thought those two links belonged to the thread on foliar nematodes and foliage diseases. (In the discussion of spots on leaves.) I didn't think they had to do with crown rot. I must have put in the wrong links... sorry!

[Wild Dog]

I guess I'm the one confused.

No, when I went to the site it had a section on crown rot that I found very incomplete so I called UMN hoping to influence them to add more information to the area on crown rot. Could not get to those responsible for that site.

Then I started a new thread, don't feel any responsibility for this thread.