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UMass Extension Landscape Message August 10, 2012

Posted by claire z6b Coastal MA (My Page) on
Fri, Aug 10, 12 at 15:22

UMass Extension Landscape Message August 10, 2012

"Impatiens Downy Mildew Update
Many growers are receiving requests for information from their home gardening and landscape customers about Impatiens downy mildew.
To help you answer questions from this audience a new fact sheet has been compiled, "Impatiens Downy Mildew in Home Gardens" Adobe PDF icon. This is a three page fact sheet (third page is colored photos) that can be printed and distributed to customers.
Just a reminder that once plants are showing symptoms advise customers to discard the plants, roots and all!

Remove and dispose of all infected Impatiens walleriana plants (standard impatiens, double impatiens) as well as all nearby impatiens plants. When discarding the plants, bag and remove the entire plant including the soil and any plant or soil debris; do not compost.

The white powdery spores on the leaf undersides do not overwinter, but are carried in wind and spread the disease. Also oospores (over-wintering spores) form inside infected stems and leaf petioles. Oospores survive in plant debris and are released into the soil as the stems decay. These resting spores are thick-walled, able to survive adverse conditions and can potentially survive in the soil for a period of years.

Advise landscape and home garden customers to remove infected plantings of impatiens. Some landscapers and gardeners are replacing impatiens with begonias as one option this season.

Tina Smith, UMass Extension, Greenhouse Crops and Floriculture Program"

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I couldn't link to the PDF file, so you have to go to the Landscape Message for that.

Claire


Follow-Up Postings:

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RE: UMass Extension Landscape Message August 10, 2012

Hi Claire,

I just heard Roberta Clark mention this UMass notice on The Point. Thank You! This the the first year that I am having a problem with Impatiens, this may be the answer.

sooey


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RE: UMass Extension Landscape Message August 10, 2012

  • Posted by claire z6b Coastal MA (My Page) on
    Tue, Aug 14, 12 at 10:26

Welcome back, sooey! ginny12 has a thread on Massive impatiens die-off--mystery that has more discussion on this depressing topic.

Claire


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RE: UMass Extension Landscape Message August 10, 2012

Hi Claire,

Yes, after I read the UMass Ex letter I found the posting by ginny. We all seem to be having the same problems with our impatiens this season. I thought damage could be limited to only a few locations and that some pots may be fine. I then watched as a Hummingbird flew from one pot of impatiens to the next and saw the flaw in my thinking. I hate to lose impatiens, they are often the only color in my garden.

sooey


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