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Cacti and Succulents: Euphorbia mildew problem

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Baja_Costero

Baja_Costero
Baja California
Mexico
(Zone 11)

November 15, 2012
4:04 PM

Post #9334150

This fall I had an outbreak of white powdery mildew on a bunch of my Euphorbias. It came in on a medusoid Euphorbia, and probably sporulated there. A couple of weeks later, it popped up on a few nearby plants, concentrated at the growth tips. Through a combination of soap spray and alcohol swabs, I think I have eliminated the active infection. But from what I've read, it's for life. So I'm wondering if anyone else has experienced this pest and has figured out a good chemical control method.

While I was looking around, I came across this article, which is pretty informative.

http://www.euphorbia-international.org/journal/pdf_files/EW5-1-sample.pdf

Madelyn Lee talks about it in Vol. 1 of the Euphorbia Journal, and says it's resistant to many/most of the usual chemical measures. I wonder if copper soap would work.

This message was edited Nov 15, 2012 4:05 PM

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