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| Black Death is a virus many claim to be on the increase. It is virus that has no cure, once signs of the virus are apparent the hellebore die within 8 months.
I have heard reports that this virus is wide spread in the UK has moved into Mainland Europe, has been found in Australia, Canada and is present in the USA. It may be present were ever hellebores are grown in great numbers. Will this be the hellebore demise? Or is this just myth, a virus spreading that kills hellebores with no known cure but to destroy any hellebore that looks infected? |
Follow-Up Postings:
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| Etiology Of A New Disease Of Helleborus Species In North America Project Annual Reports 2002 Annual Report Related National Programs Plant Diseases (303) Project Team Mahaffee, Walter - Walt Project at-a-glance Project Number: 5358-22000-024-03 Project Type: Grant Start Date: Sep 28, 2001 End Date: Jul 31, 2003 [Printer Friendly] Objective: Determine the relationship of carlaviruses to diseases of Hellebore in the PNW; compare the carlavirus with the viral disease observed on Helleborus in the eastern USA, and with "black death" disease reported in Europe/UK; determine whether other viruses or infectious agents are associated with the diverse range of symptoms observed on the infected plants; disseminate results and develop an IPM program. Approach: |
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| Opps! Meant to have another link, some how posted the whole thing! USDA link, click the "Summary With the Most Recent Annual Report". |
Here is a link that might be useful: Black Death
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- Posted by goswimmin 7b (mwenger798@aol.com) on Thu, Feb 13, 03 at 18:56
| Thanks Bruce, Thanks so much for the information. Today I was out there cutting off the old leaves of the plants and all I came across was the regular winter damage to the leaves. Some of my leaves got burned by the cold temerpatures we had this year but so far no black spotting. It looks really terrible. I have never seen aphids on my plants but will really look for them now. Mary |
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| interesting Belgian site! |
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| Hi Bruce, Thank you. Let's hope this avoids my little corner of the world. I thought it was interesting that aphids may be suspect....the only insect damage I've had on hellebore was a heavy infestation of aphids on new shoots of foetidus Sienna last year; they'd really multiplied by the time I looked low enough in the evergreen foliage to notice. |
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- Posted by pansgardener_waz7 Wa. z7 (My Page) on Fri, Feb 14, 03 at 1:52
| Thanks Bruce. Ignorance may be bliss but Knowledge is power. JoAnn |
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| You should not confuse this virus with Conithyrium hellibori, black spot of hellebore. This fungus can be a huge problem too. It is described as large, irregular, dark brown to black spots on both sides of leaves often running together. This is very common on hellebore especially Helleborus niger. You can also confuse this virus with Botrytis. This makes the black death virus very confusing. From what I read and understand the virus will spread fast under different garden conditions than Conithyrium and Botrytis. If you have alot of hellebore and have bought new hellebore routinely over the years from many different sources you should study and understand the different leaf spot fungus and this new virus. If you have hellebore that have been around for a long time or have acquired from a friend who had the hellebore for a long time you should have little to worry about. This virus has been identified just recently and has been established from what I have read in large horticultural businesses that grow hellebore. I hope if any of the above statements are not accurate that it is corrected, if not in this forum send me an email. I consider private emails private and would not repeat the source of accurate information. Bruce |
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| Purchased a foetidus last year, my first. I have many nice clumps of helleborus, Lenten Rose, but no other varieties. The foetidus developed a black rot at the base of the plant which extended up the stalks. Tried to find what was killing it, have never had a problem with any fungus or any disease at all with the Lenten Rose. I dug it up eventually and destroyed it but the disease described here, does not exactly describe what I saw. Any ideas? |
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| This sure sounds like the activity of one of the watermolds. I have seen these symptoms myself in H foetidus, they are difficult to confuse with Coniothyrium (read Bruce's excellent discription above)and the end product is generally the death of the infected plant. I routinely dip with one of the fungicides such as Fongarid or Alliette to prevent this. |
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