Downy Mildew on Impatients - Serious

shymilfromchiSeptember 9, 2012

I heard a radio program this morning (Mike Nowak WCPT) about how the entire impatients walleriana crop is being wiped out by downy mildew that seems to be caused by the erratic weather we've experienced lately. It is very serious. If you see the symptoms described on his website, ("Mike Nowak Show" than go to the "This Weeks Show" button on the left side of the page) light gray fuzz on the UNDERSIDES of the leaves and deterioration of the plant, he says to immediately carefully pull the plant(s) and put it in a plastic bag - do not carry it over your garden. Try not to let it get into the soil more than absolutely necessary as it infects the soil and stays there. Put it into the municipal garbage, never your compost.

Mikes guest describes how the wind can blow the disease many miles, so it is impossible to control it. It is showing up in much of the country.

Downy mildew is different than powdery mildew, which is not as serious.

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Thanks for posting this...I had breifly heard something was going on with them but couldn't remeber what it was called. All I know is that every plant I planted (10 flats) have all died, except for two pots on my porch. I looked up what the affected plants looked like and thats what I have alright. Thanks again for the info...

    Bookmark   September 9, 2012 at 9:32PM
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tsugajunkie z5 SE WI

It's been around for a number of years and getting worse. Although my own seed started plants have not yet been affected, they could be.


Here is a link that might be useful: From the annuals forum

    Bookmark   September 10, 2012 at 3:40AM
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rosiew(8 GA)

There's a lot more information available. Suggest googling IMPATIENS DOWNY MILDEW. You'll find other Gardenweb threads there, plus University studies and more. Very important to remove/bag all plants that have been affected - including the dropped leaves and stems.

In mourning for now. They will find a cure, but maybe not for several years. Growers are taking extraordinary measures to prevent this.

Rosie, Sugar Hill, GA

    Bookmark   September 12, 2012 at 2:20PM
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