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Fri, May 23, 14 at 12:00
| I've been reading some material on GreenCure, a fungicide developed by R. Kenneth Horst, the Cornell professor that co-wrote the authoritative Compendium of Rose Diseases and Pests (I'm not shilling for the book, but it's a pretty good detailed look at rose problems). Since Mr. Horst seems to know what he's talking about of rose diseases and pests, I wonder of anyone has used his GreenCure as a fungicide. Its active ingredient is potassium bicarbonate, used in baking and in some dry fire extinguishers. Any feedback on this fungicide? |
Follow-Up Postings:
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| It's said to be very effective against powdery mildew, probably not so much against blackspot under heavy disease pressure (eastern US). I have used bicarbonate mixtures and they helped some. This product is less likely to burn foliage than homemade mixtures. |
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| Let me add, I used to use plain micronized sulfur (also considered "organic"), and it works pretty well if you start early and stay with it. |
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| I've used Green Cure several times. As Michael said it works better on mildew than it does on black spot and you have to use the "cure" ratio. The "prevention" one didn't do much of anything at all. You also have to use it often and regularly if you want to keep things clean. In my opinion it's just so-so. |
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- Posted by nikthegreek 9b/10a E of Athens (My Page) on Sat, May 24, 14 at 0:16
| I've used lab grade potassium bicarbonate as PM preventive. It works if you keep using it during times of pressure. It does not seem to be very effective on some roses that are true mildew disasters but it can keep the other ones clean. I have not noticed any real curative effect though. Nik |
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| I've used other brands of potassium bicarb fungicides. As others have said, it is pretty good for powdery mildew. However, over the years I have culled my roses of the worst offenders. These days I get in my dry summer climate with a single copper fungicide spray at pruning time. In a more humid climate I might have to reconsider the fungicide issue. Here I don't use them much. Folly |
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- Posted by nikthegreek 9b/10a E of Athens (My Page) on Sat, May 24, 14 at 0:30
| Folly, copper is no good for PM so I suppose you don't face that menace where you live. Copper for downy mildews and lots of other fungal diseases, sulphur for PM and mites. That's what my grandad used to say. MInd you he was talking about grapevines not roses. Nik |
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