Northern Gardening forum: Lilac Blight, Fungicide Question

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Mar 14, 2013 2:23 PM CST
I'm in SouthEast Pennsylvania, near the Delaware border. In a house we just bought, was overgrown very badly. After a YEAR of weeding, I now have a pretty cleaned-up garden, and some diseases to take care of.

I have two nice old lilacs that are showing signs of disease as they are emerging in this current sunshine. New growth is pale, wimpy green, with black edges that spread. Last year I noticed whole branches turning black.

I am thinking Pseudomonas (lilac blight), and/or powdery mildew. I have done some Penn State U. research, recommending spraying mancozeb and copper together, to potentially take care of both. I realize that spring damage is damage for the year. Will try to treat better next spring, now that I know about the disease.

Can anyone recommend a recipe for this disease, including possibly mancozeb and copper? (there is a product called ManKocide, but it doesn't seem to be available here).

These are very large lilacs, and I'd like to save them. Any advice?

Thumb of 2013-03-14/robinhawk/1348ce
Name: Christine
Southeastern MN (Zone 4a)
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Apr 4, 2013 9:39 AM CST
That is so sad! I have not seen that before!
"Remember this: Whoever sows sparingly will also reap sparingly, and whoever sows generously will also reap generously."
2 Corinthians 9:6
Name: woofie
NE WA (Zone 5a)
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Apr 4, 2013 10:18 AM CST
The Oregon University Extension recommends spraying with copper sulfate. Can you get that?
They also have some other recommendations to help avoid the problem in this article here:
A bit more information from WSU: http://www.spokane-county.wsu....
Confidence is that feeling you have right before you do something really stupid.

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