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Impatiens--Downy Mildew

Discussion in 'Pests, Diseases and Cures' started by redstar, Apr 6, 2013.

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redstar Total Gardener
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Over here in America we have our Impatiens with the downy mildew disease.
One of my favorite nurseries. Groff's Plant Farm in Quarryville, PA will not carry them this year, they project two years before we can use them.
Sad for me and my shade gardening as they are the only ones that I love to use.
He suggests: begonias and torenia as an alternative. I 've used the begonias before but in an area where there is some sun for a few hours daily, but they did not seem to grow much beyond original size. In any event looks like I will save money and time this year.

redstar, Apr 6, 2013
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Marley Farley Affable Admin! Staff Member
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Yup same here.. none of my local nurseries are doing them round here either.. What about some Veronica to rassle around in your shade areas..?It is a perennial but there are 500 different kinds.. https://www.google.co.uk/search?q=V...516,d.d2k&fp=7f85050f64c99f0&biw=1366&bih=623
Lovely little plants & just real survivers...

Marley Farley, Apr 6, 2013
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JWK Gardener Staff Member
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Last year I ordered and grew 120 Busy Lizzies from plug plants, they grew strongly with a lovely show of blooms until mid-summer, then were hit by Downy Mildew, it completely obliterated them within a few day.

This year I've ordered plug plants of New Guinea Impatiens, they are immune from Downy Mildew so I'm looking forward to seeing what they are like. See if you can get them instead Redstar

JWK, Apr 6, 2013
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HarryS Eternally Optimistic Gardener
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The Bizzie Lizzie mildew has basically stopped most sales in the UK . Last year the big retailers Homebase and B and Q did not stock them at all . I have grown , from mail order plugs , New Guinea Sunpatiens® for the last 2 years . These are an excellent plant , available in two sizes , compact and vigorous . The bigger one will fill a 35cm container.
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HarryS, Apr 6, 2013
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redstar Total Gardener
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Groff nursery did select the New Guinea, but I am hesitant to plant them in the front foundation area where the most shade lies. but with the word vigorous attached I might venture there. And I will look for the Vereronica at the nursery. Thanks all. Not planning on fussing with much "new" plantings until May 15 after our return from holiday. Still cleaning up and raking, the limbs and twigs everywhere, rake, rake, rake. Thank goodness we can burn here.
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redstar, Apr 7, 2013
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Spruce Glad to be back .....
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http://www.classiccaladiums.com/

Can you grow these instead or is it to cold ?? they love the shade

Very popular in America ?

Spruce

Spruce, Apr 7, 2013
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Sorry, can't grow Caladiums. However, we do by them from green houses already up. And I do have several of the "bulbs--roots" over with my garden friend up the street keeping in her basement for this years plantings in my pots. So probably end of May we will get them going. Or she might and then call me when ready. You think my gardens are big, should see her property, it is double my gardens.
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redstar, Apr 7, 2013
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JWK Gardener Staff Member
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HarryS said: ↑
I have grown , from mail order plugs , New Guinea Sunpatiens® for the last 2 years .
Click to expand...

Hi HarryS - which supplier do you use?

I have been badly let down by the gardencentregroup, I pre-ordered plugs of New Guinea impatiens (and a few other flowers as well), I didn't hear anything from them at the selected date. I contacted them a couple of days later and they said they had a problem obtaining them, it's was annoying that they didn't have the decency to contact me, so it was too late to order elsewhere. I won't be using them in the future.

Anyway, I bought a couple of large NG impatiens at another GC last night with the idea of taking cuttings.

Has anyone got experience of rooting cuttings from these? I'm hoping it's going to be straightforward.

JWK, May 10, 2013
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HarryS Eternally Optimistic Gardener
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John - I ordered Sunpatiens from this company Climbing plants direct , they also sell on Ebay at the same price . I was pleased with the quality. They do two types compact and vigorous in 5 or 6 colours . The vigorous will fill a 14" basket . They will flower through to November is sun or part shade. I think its a lovely trouble free plant

http://www.climbingplantsdirect.com/Category.asp?SearchText=sunpatiens
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HarryS, May 10, 2013
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Thanks Harry, I'll maybe use them next year, the prices look OK.

JWK, May 10, 2013
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HarryS Eternally Optimistic Gardener
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Does anyone know of any development on introducing mildew resistant Busy Lizzies
I would think that the first company to introduce a successful patented plant would make big bucks !

HarryS, May 11, 2013
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Marley Farley Affable Admin! Staff Member
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I was looking at that the other day funnily enough Harry, but couldn't find much.. I thought this might interest a few though..

One peculiar aspect of this outbreak is that the pathogen that is thought to cause the disease has been reported in North America since the 19th century. Called Plasmopara obducens, it’s one of the oomycetes, or water molds, a group that includes the pathogen that caused the Irish potato famine and the one wreaking havoc in California and Oregon with sudden oak death. Once the disease shows up in a plant, there’s no cure. The pathogen can waft along on air currents, swim and perhaps survive the winter in soil.

Until recently, P. obducens seemed relatively mild mannered, says Marco Thines, an evolutionary biologist at the Biodiversity and Climate Research Centre in Frankfurt, Germany, who has studied oomycetes. Cells of the pathogen whip through a film of water by lashing their propeller-like flagella. They colonize plant tissues by punching through cell walls and, once inside, poking nutrient-harvesting nubbins against the cell membrane like fingers squeezing a balloon.
Downy mildews can often attack only a restricted range of species, says plant pathologist Phil Jennings of the United Kingdom’s Food and Environment Research Agency. P. obducens strikes garden impatiens, Impatiens walleriana, and some cousins. It doesn’t destroy a related blooming annual, the New Guinea impatiens, I. hawkeri.
Delving into the genetics of the pathogen may clarify how the disease has changed to become more virulent. What has been considered one species may actually be several, and some variant may have evolved into an alarming form.
“I don’t think this is our grandfather’s Plasmopara obducens,” says plant pathologist and former U.S. national mycologist Joe Bischoff of the American Nursery & Landscape Association.
Preliminary analyses show at least three distinct genetic groups within P. obducens populations, Warfield says. In the lab, all three “are equally destructive,” she reports. Each can wreak havoc in at least some gardens, but whether they survive equally well in varied environments remains to be seen.
Garden impatiens may come in an array of colors, but all commercial varieties of Impatiens walleriana and interspecific hybrids with an I. walleriana parent are susceptible to the disease, Warfield says. “Developing a downy mildew–resistant garden impatiens is likely to take many years, and it may not even look like the garden impatiens of today.”
Click to expand...
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Marley Farley, May 11, 2013
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HarryS Eternally Optimistic Gardener
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Well that has cheered me up no end Marley !
It sounds like the cheery Busy Lizzie is not going to be around for quite a few years
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HarryS, May 11, 2013
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Marley Farley Affable Admin! Staff Member
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Aww sorry Harry.. It is a shame but maybe they will make a breakthrough... Trouble is all this humid weather we are getting in the summer is not helping at all.... Oh for a long hot dry summer, like they seemed years ago.......
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Marley Farley, May 11, 2013
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intel Gardener
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Was in Tesco this afternoon and was surprised to see them on sale in the store.

intel, May 11, 2013
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