Ask a Question forum: Downy Mildew on Impatiens - baking soda/water/dish soap?

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Name: k green
SE Pennsylvania
binky977
Aug 17, 2017 1:56 PM CST
Hi guys!
I'm in SE PA and this is the first year I've have encountered DOWNY MILDEW!
All summer my inpatients have been growing fine, but the last 2 weeks have been mild heat wise, and pretty wet. No brown grass which is unusual. I noticed in some sections of my garden my plants almost over night started dropping flowers and the leaves were turning yellow. I found the underneaths to have that white downy mildew powered.
Most plants have been dug up. I have 2 very large pots that aren't as bad but they do have DM, just the early stages I guess.
I read that a mixture of 1tbsp baking soda, 1/2 tsp dish soap, and 1 gallon of water helps get rid of DM. Is that true?
Is saving my plants too late? If once infected is all hope lost?

thanks in advance
Name: Yardenman
Maryland (Zone 7a)
Image
Yardenman
Aug 17, 2017 2:18 PM CST
binky977 said:Hi guys!
I'm in SE PA and this is the first year I've have encountered DOWNY MILDEW!
All summer my inpatients have been growing fine, but the last 2 weeks have been mild heat wise, and pretty wet. No brown grass which is unusual. I noticed in some sections of my garden my plants almost over night started dropping flowers and the leaves were turning yellow. I found the underneaths to have that white downy mildew powered.
Most plants have been dug up. I have 2 very large pots that aren't as bad but they do have DM, just the early stages I guess.
I read that a mixture of 1tbsp baking soda, 1/2 tsp dish soap, and 1 gallon of water helps get rid of DM. Is that true?
Is saving my plants too late? If once infected is all hope lost?

thanks in advance


If I am understanding the plant symptoms correctly you may have powdery mildew which is a moist fungus proble. One solution is the expose the plants to more sunlight. An organic solution is to spray a mix of 1 gallon water to a tablespoon baking soda and some light oil. I have recently read about success using a 10% whole milk mix.

I understand why baking soda would work; lowering the Ph. I have no idea why milk does unless it is the biotic content.

Name: k green
SE Pennsylvania
binky977
Aug 17, 2017 2:23 PM CST
Yardenman said:

If I am understanding the plant symptoms correctly you may have powdery mildew which is a moist fungus proble. One solution is the expose the plants to more sunlight. An organic solution is to spray a mix of 1 gallon water to a tablespoon baking soda and some light oil. I have recently read about success using a 10% whole milk mix.

I understand why baking soda would work; lowering the Ph. I have no idea why milk does unless it is the biotic content.



I believe 100% I have it. All signs definitely point to it. I tried moving plants away from the infected ones but they still got it. Do you think this spray could reverse it and help save them? They were just doing so well I'm heartbroken. I grew them from seeds. Grumbling

Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 17, 2017 2:32 PM CST
The best thing with impatiens downy mildew is to get the plants out of the ground and destroyed as soon as possible before the spores get into the ground, and don't grow impatiens in that same area for the next season/s. There's some more info from the Royal Horticultural Society here:

https://www.rhs.org.uk/advice/...

And from Michigan State U Extension:

http://msue.anr.msu.edu/news/h...
[Last edited by sooby - Aug 17, 2017 2:40 PM (+)]
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