All Things Gardening forum: Impatiens disease across America

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Name: Nancy
West Central Wisconsin on the (Zone 5a)
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lilyfan
Feb 18, 2013 12:19 PM CST
This is something i think you would want to know...I just read that the beautiful shade flower Impatiens has a massive pathogen sweeping around America..no good for the growers and gardeners! Here's some Utube information to explain it further..the person who wrote the original post is a well regarded plant expert and he said it is going all over America!
Dr. Doug Caldwell of the Univ. of Florida updates on Plasmopara obducens that is attacking impatiens
http://www.youtube.com/watch?v=Q-H3EIXRzhE&feature=youtu.be

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Name: Paul
Allen Park, MI (Zone 6a)
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paulgrow
Feb 18, 2013 5:08 PM CST
It;s Downy Mildew, it has hit the Curbit crops here in Michigan about 3 years ago. We have a huge pickle industry here in Michigan and those farmers have been hit really hard.
You can use a fungicide spray for prevention.
The disease is spread by spores carried by the wind.
BTW it does not affect New Guinea Inpatients.
Gardening is cheaper than therapy and you get tomatoes. ~Author Unknown
Name: Arlene
Grantville, GA (Zone 8a)
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abhege
Mar 2, 2013 2:09 PM CST
So should I be worried about impatiens I have just started from seeds? I am in Georgia. Shall I use fungicide as a preventative measure?
Name: Paul
Allen Park, MI (Zone 6a)
Charter ATP Member Canning and food preservation Vegetable Grower Seed Starter Roses Region: Michigan
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paulgrow
Mar 2, 2013 3:34 PM CST
Don't plant them in the same location as last year.
Here is a link with some great info
http://msue.anr.msu.edu/news/new_website_assists_gardeners_i...



Gardening is cheaper than therapy and you get tomatoes. ~Author Unknown
Name: Arlene
Grantville, GA (Zone 8a)
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abhege
Mar 9, 2013 4:35 PM CST
Okay. I didn't have any last year! Thanks for the link. I'll check it out!
Name: Cheryl
Kingwood, Texas (Zone 9a)
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ShadyGreenThumb
Mar 9, 2013 7:13 PM CST
Thanks for this. Having a shady garden, I rely on flats and flats and flats of colorful impatiens to bring color to my yard. It sounds like the mildew can spread to other plants. That's not good!!! Maybe I will stick with begonias this year.
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Name: Marilyn
Greenwood Village, CO (Zone 5b)
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CDsSister
Mar 9, 2013 8:18 PM CST

I blamed the heat for mine dying out so quickly, maybe it was this. Angry

If I had other plants nearby is there any action I could take to mitigate the chance of them being infected? I'm all ears!



Name: Bob
Vernon N.J. (Zone 6a)
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NJBob
Mar 10, 2013 7:26 PM CST
http://www.delawareonline.com/article/20130207/LIFE0402/3020...

I work at a garden center and the growers informed us that they might not supply them this year
From what I have read the mildew is becoming resistant to the fungicides . And when they do work they only help resist the mildew not prevent it.
Make sure not to compost these plants.
I also read that it can be carried on the seed.
Name: Julia
Washington State (Zone 7a)
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springcolor
Mar 10, 2013 7:49 PM CST
Not good I have a bunch growing in my greenhouse. Was just going to transfer them from the flat to 4 inch pots. This was older sedd so maybe I will be ok. This is so sad, love these in the garden.
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Name: Bob
Vernon N.J. (Zone 6a)
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NJBob
Mar 10, 2013 7:55 PM CST
If I do get any I will put them in containers so I can just throw the soil out if they do get infected.
Name: Arlene
Grantville, GA (Zone 8a)
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abhege
Mar 10, 2013 8:03 PM CST
I know, I started seeds too...I'll try the fungicide and plant is containers also, I guess...
Name: bb
north of boston on the coast
I was one of the first 300 contributors to the plant database! Garden Ideas: Level 1
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lilylady
Mar 11, 2013 3:08 PM CST
No regular impatiens will be OK whether you had them last year or not. The downy mildew is IMpatien Downy Mildew and is traveling from garden to garden. I'll see if I can find the map. It traveled quickly last year from state to state.

When it attack around here, plants went down in 2 weeks. Hundreds and hundreds of them. I was dumbfounded until I asked around. Cornell did a study and put out its findings.
Nursery had no signs as they were using preventative measures but as soon as the plants were in the gardens, the problem spread from somewhere. I had the feeling whatever had been sprayed just wore off and the plants them selves came in with it. Who knows.

Recommended that all plants be pulled/dug up and thrown in plastic garbage bags, not into the compost pile. It was heart breaking. And a pain to plant all new plants (and quite an expense)

Anyway, no more impatiens for me.
Name: bb
north of boston on the coast
I was one of the first 300 contributors to the plant database! Garden Ideas: Level 1
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lilylady
Mar 11, 2013 3:11 PM CST
Here is the map showing it spreading from 2011 to 2012

http://www.todaysgardencenter.com/article/32948/map-shows-dr...
Name: Arlene
Grantville, GA (Zone 8a)
Greenhouse Region: Georgia Garden Sages Organic Gardener Beekeeper Vegetable Grower
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abhege
Mar 11, 2013 3:12 PM CST
DARN! My seedlings are doing really well this year too! Thumbs down

what if I kept in the house like a houseplant? I know, that won't work, we open the doors and windows...so what should I do?

Bubble impatiens Green Grin!
Name: Myriam
Ghent, Belgium (Zone 8a)
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bonitin
Mar 12, 2013 4:03 AM CST
I'm glad this subject came up! I also was dumb folded now three years ago, not understanding why my seemingly perfectly healthy and thriving Impatiens walleriana almost from one day to the other suddenly looked distressed, yellowing leaves falling off, leaving the stems bare and bending down, falling flowerbuds etc..I didn't know at the time what could have been the cause, they where planted all in different locations and all where affected. The two next years nearly exactly the same scenario happened, in the mean while I had found out about the devastating disease!

Interesting enough, that first year in 2010, I had an Impatiens walleriana grown that came up in a pot of an Elephants Ear I had collected in the wild in the rain forests of Brazil during my trip that time. It must have smuggled itself in as a seed. Rolling my eyes.
In the wild they do grow very tall, mine became nearly 1m tall. This plant got NOT infected, I even overwintered it inside and it did very well, the next season outside it still did well again growing very tall and vigorous. All the others bought, fell victim once more to the dreadful disease. Eventually I lost the Brazilian one, not by the disease, but probably from getting too wet after a very long period of excessive rains in late Autumn, I had waited too long too to take it inside, but I had collected seed and am now growing a couple of seedlings, also from seed I collected from the infected bought plants. I had read somewhere that the seed is not affected by the disease..Again the seedlings from the Brazilian Impatiens are significantly taller. I'll see what will happen this coming season..
Name: bb
north of boston on the coast
I was one of the first 300 contributors to the plant database! Garden Ideas: Level 1
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lilylady
Mar 12, 2013 1:58 PM CST
So sad.

Seed might not be infected but the new plant, planted outside will soon get infected from whatever is growing in the surrounding area.

Sorry to be the sound of bad tidings.

Not a happy camper here, either.
Name: Bob
Vernon N.J. (Zone 6a)
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NJBob
Mar 12, 2013 8:11 PM CST
From what I read the infection is not in the seed but can be carried on the seed , so as the seed germinates it can become infected http://www.anla.org/knowledgecenter/premium/index.cfm?view=p...
Some info if you have the time to watch it.
Name: Myriam
Ghent, Belgium (Zone 8a)
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bonitin
Mar 13, 2013 3:02 AM CST
never mind Lilylady, I am mentally prepared for eventual failure Rolling my eyes. I'm testing out some natural fungicides like cinnamon and garlic powder, also neem oil. I don't want to use chemicals. I started mixing it into the potting soil of the seedlings and sprinkle more cinnamon powder on the top soil. Who knows if it might work, one can only try!


Yes, it sounds plausible that the infection is not in the seed itself but carried by it, Bob!
Thanks for the link, I had already read a lot about it but hadn't come upon that one yet, very informative!
Name: Paul
Allen Park, MI (Zone 6a)
Charter ATP Member Canning and food preservation Vegetable Grower Seed Starter Roses Region: Michigan
Plant and/or Seed Trader Enjoys or suffers cold winters Container Gardener Composter I was one of the first 300 contributors to the plant database! Garden Ideas: Master Level
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paulgrow
Mar 13, 2013 1:05 PM CST
From what I hear in this area the wholesale growers are not even going to sell them.
Be wary of the big box stores they sell everything diseased or not.
Paul
Gardening is cheaper than therapy and you get tomatoes. ~Author Unknown

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