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Dying Canes and Fungicide
Julie, I have not had the pretty extensive damage you are seeing. But I've seen a lot of damage caused from spraying in high heat when the roses is transpiring the most. Its the heat not the sun that causes damage. As I noted earlier My cornell mix does this unfailingly. As far as the least resistance to BS correlation I can't imagine it. In my experience most tip die back begins with the roots. If the roots are not collecting enough nutrients the rose begins cutting back on cane. -- Theo in Zone 5 Kansas City "Unique Too" wrote in message ... Dave wrote: The thing that alarms me is a purple "bruising" on the stems of Old Blush, Several of my roses are having a similar problem. The canes develop purplish spots, then the cane turns yellow with spots and then dies. This condition develops not on the small end branches, but on either a main cane or lateral. When the cane starts to go, the tips of the branches above the cane with start dying, looking like dieback. From spots to dead isn't long, a week or two at the most. If it is dieback or canker, fungicides should help. When I first noticed it, I began spraying more regularly, but I have never used Banner Maxx more often than 14 days. I must wonder if the problem is not a lack of fungicide but the result of fungicide, specifically Banner Maxx. I never had this problem until two years ago, a few months after I started using Banner Maxx. The only roses affected are those that are sprayed and all the sprayed roses, except Rose de Rescht, show the same symptoms. I've read other posts, on other boards, where dieback/canker/whatever is becoming more of problem than ever before. And I believe more people are using Banner Maxx, it seems to be the current favorite. I'm not accusing Banner Maxx, I'm not convinced it is the problem, but I do wonder. It could be the roses least resistant to BS are also the least resistant to whatever is causing this problem. I've stopped spraying the two roses most affected, they are down to one cane already. Since I expect to loose them anyway, they are my test roses. If the situation improves on these two roses, I'll start spraying again, but not with Banner Maxx and see what happens. Anyone else having the same/similar problem? Any comments? Julie |
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