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Dying Canes and Fungicide
"Theo Asir" writes:
So I went looking and this is apparently not very well known but Downy Mildew apparently causes these blotches on rose canes. I couldn't even find a good picture but try this one. http://www.cruzio.com/~rbedard/devor...wnymildew.html The last two photos of the leaves sure look familiar to me. I even brought a couple inside so I could look at the leaf and photo at the same time. I think you might have found the answer. I've always used Dithane M-45 as one of my fungal sprays. All the articles I found mentioned it was effective against DM. When I started using Banner Maxx, I began using the Dithane less often. So that fits with my blaming Banner Maxx. It also mentions high humidity being a requirement, we certainly have plenty of that here. One of the non HT roses affected does get a lot of shade. The other non-HT, Belinda's Dream is so very thick and full, even growing alone it can't possibly get good air circulation. I think I'll go back to using Dithane as my primary fungicide and see what happens. Of course our temps stay in the upper 80's now so I should notice a decrease anyway. Maybe you're right again, Theo. Maybe... |
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