Ask a Question forum: Verticillium in Bagged Potting Soil and Peat Moss?

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Indiana
tebaldi64
Sep 19, 2017 10:56 AM CST
I bought two viburnums in beautiful condition, and since my soil is very poor, I amended it with potting soil and peat moss, both left over from last year. The two plants promptly showed signs of severe verticillium wilt, which has never affected any other viburnums in my garden. Can this fungus develop in bagged soil amendments?

Thanks.
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Sep 19, 2017 12:05 PM CST
Welcome!

How was it diagnosed as verticillium wilt?
Indiana
tebaldi64
Sep 19, 2017 12:42 PM CST
sooby said: Welcome!

How was it diagnosed as verticillium wilt?


______

I didn't have any laboratory tests done, but the condition of the plants and their leaves is exactly typical for this problem as illustrated in all the books. My original question was about the source of the infection, but I am also unsure whether to leave the shrubs be and see if they survive to next season or whether I run the risk of infecting my other viburnums if I don't rip them out.
Name: Daisy I
Reno, Nv (Zone 6b)
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DaisyI
Sep 19, 2017 3:47 PM CST
More likely, the peat was not completely moistened and so burned the roots of your new plants.
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Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Sep 19, 2017 4:17 PM CST
I was thinking the same thing as Daisy, it is very difficult to re-wet dried peat moss, so by asking about the diagnosis I was thinking they might have been too dry around the roots instead (especially since you said they wilted promptly, that seems too quick for verticillium). Growers often use soilless mixes to get around problems with verticillium wilt so I'd be surprised if that was a source. Since you haven't removed the plants can you post a picture, and can you also cut through a branch and post a picture of the cut end?
[Last edited by sooby - Sep 19, 2017 4:19 PM (+)]
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